Salted Caramel Popcorn Cake

This salted caramel popcorn cake will blow your mind and set off fireworks on your tastebuds. With pillowy soft peanut butter sponges, insanely delicious brown butter frosting, an overabundance of salted caramel and a small mountain of caramel popcorn. Plus, it’s gluten free. Sounds rather perfect, doesn’t it?

This post has been created in collaboration with VonShef. All opinions expressed in the post are my own… plus, there’s cake – so read on. (For more information you can check out my Disclosure Policy.)

The salted caramel popcorn cake on a decorative cake stand, with a generous caramel drizzle, dripping down the sides, and a heap of caramel popcorn on top.

How much caramel is too much caramel? Asking for a friend.

Okay, okay, so I might have gone slightly overboard with the salted caramel drizzle. But… if we’re making a salted caramel popcorn cake, we might as well go all out on both the caramel and the popcorn front. Right? Right. Glad we agree.

Because there’s no such thing as over the top round these parts (if you didn’t know that before, you do now): we’re also adding peanut butter sponge cakes and brown butter buttercream frosting into the mix.

I can just see your brain self-combusting right about now.

The thing is… each of these components is perfect on its own (I could eat the brown butter frosting with a spoon, and don’t even get me started on the caramel popcorn) – but when they combine together, the results are EPIC.

The salted caramel popcorn cake on a decorative cake stand, with a piece having been cut and placed on a white plate next to the cake stand.

The peanut butter sponge cakes don’t have an in-your-face peanut butter flavour, though you could give them an extra oomph by using peanut butter powder to replace some of the flour. Instead, the peanut butter flavour is gentle and fits seamlessly with the other cake components.

The sponges are soft and moist – and gluten free. Just, you know, without being obvious about it. Trust me, there’s not way you can guess this caramel popcorn cake is gluten free.

Close-up of a slice of the salted caramel popcorn cake.

Okay, so we could skip making the brown butter frosting and just make your “normal” buttercream… but we’re way too extra for that.

Brown butter is magic. It’s as simple as that. If you’ve never browned your butter before, you’re missing out. The nutty, caramelised notes pack an insane flavour punch, and when you whip the (cooled) browned butter into buttercream frosting… your tastebuds will thank you.

Now, some people will say I’ve gone too far with the salted caramel drizzle. First of all, “drizzle” really doesn’t cover the situation going on here. “Waterfall” would be more accurate. And second of all, everyone loves caramel. And a measly drizzle may be okay for some, but we’re too badass for that. So there.

Close-up of the salted caramel popcorn cake on a decorative cake stand, with a generous caramel drizzle, dripping down the sides, and a heap of caramel popcorn on top.

The cake is finished with a small mountain of caramel popcorn, which is dangerous and way too delicious for its own good.

Basically, if you’re looking for a completely outrageous, dangerously delicious GLUTEN FREE cake that may or may not put you in a sugar coma… this is it.

And believe it or not, it’s super easy to make! So let’s get baking.

MAKING THE GLUTEN FREE PEANUT BUTTER SPONGE CAKES

First, the sponges. The ingredients are simple, and I bet you have all of them already in your pantry.

To feel like a proper chef, weigh the ingredients out in the VonShef stainless steel mixing bowls. There’s nothing like a pretty mixing bowl to make you feel like a baking pro. (And yes, mixing bowls are pretty. End of discussion.)

The ingredients needed for the peanut butter sponges of the salted caramel popcorn cake.

And the procedure fro making the sponges is just as simple:

  1. Mix the milk and eggs together
  2. until you get a homogeneous mixture.
  3. Sift the dry ingredients together
  4. and whisk in the butter and peanut butter. I like to do this with my VonShef hand mixer, which does the job perfectly.
  5. Add in the wet ingredients
  6. and whisk away until you get a lovely smooth batter.

The six-step process of making the gluten free peanut butter sponge cakes.

Then pour the batter into your prepared cake tins (behold the lovely ribbons of perfectly mixed batter) and bake until fluffy and golden brown on top.

Pouring the cake batter into the prepared cake baking tins.

The three peanut butter sponges on a cooling rack, prepared for cake assembly.

MAKING THE BROWN BUTTER FROSTING

Browning butter sounds way more complicated than in actually is. All you have to do is melt the butter and then let it cook on medium-low heat with stirring, until it starts foaming and becomes dark brown in colour.

There will be dark bits floating around, and it might be tempting to throw those away – don’t. They carry SO MUCH flavour, and your buttercream will be all the tastier for them.

Once you’ve got your browned butter:

  1. Pour it into the bowl you’ll use for mixing. Extra points if you have one of the VonShef 3 piece mixing bowl sets with the non-slip silicone bases (or “anti-slide bottoms”  as I like to call them). Handiest. Bowls. Ever. (Also: pretty.)
  2. Allow the browned butter to cool at room temperature (or in the fridge if you’re feeling impatient)
  3. until it firms up but you can still stir it easily.
  4. Then, whisk it up with some powdered sugar and behold the off-white SUPER FLUFFY awesomeness that results. Have a taste. Do a happy dance. So. Good.

The flour-step process of making the brown butter frosting.

ASSEMBLING THE SALTED CARAMEL POPCORN CAKE

Now for the fun part!

Once we have all the cake components ready, we can get on with putting the salted caramel popcorn cake together and making it ultra-beautiful (in this case: drowning it in salted caramel).

Plus, this gives me extra room to show off some pretty photos to you. Don’t ask. It’s a blogger thing.

Choose a pretty cake stand, and place it on a rotating cake stand, if you have one. On a side note, I never understood why people decorate cakes directly on a rotating cake stand and then go through all the fuss involved in transferring the cake to the actual cake stand.

Placing the cake stand on top of the rotating stand fixes that problem. Yay!

Start with a peanut butter sponge, spread a generous amount of buttercream on top and drizzle with salted caramel. And repeat.

First layer of the salted caramel popcorn cake: the caramel is being drizzlen onto the brown butter frosting that has been spread onto the fist sponge layer.

Piping the brown butter frosting onto the second layer of peanut butter sponge.

Second layer of the salted caramel popcorn cake: the caramel is being drizzlen onto the brown butter frosting that has been spread onto the second sponge layer.

Next up, place the final sponge cake on top, and use the remainder of the brown butter frosting to cover the top and sides of the cake. Smooth out the frosting with the VonShef dough scraper and cutter – now, don’t let the name fool you, this handy tool makes the perfect icing smoother.

Then, refrigerate the cake for about half an hour. This will firm up the frosting and ensure that we don’t end up with a mess once we get on with the decorating.

Smoothing out the brown butter frosting with an icing smoother.

All that’s left to do now is to smother the cake with ALLTHECARAMEL and cover its top with a mountain of popcorn. Of course, you can be more… sophisticated about it. But I kinda like the slightly rough-around-the-edges look of this salted caramel popcorn cake.

It just… really makes me want to eat it. And that’s the only important thing with a cake, right?

The salted caramel popcorn cake on a decorative cake stand, with a generous caramel drizzle, dripping down the sides, and a heap of caramel popcorn on top.

So there you have it, folks. A surprisingly simple to make, 100% gluten free and completely outrageous salted caramel popcorn cake that will steal the show no matter the occasion.

But it’s so much more than just a sugar-overloaded dessert. It’s a tantalising mix of subtle and intense flavours, of contrasting textures… and yes, of caramel and popcorn and peanut butter and browned butter. And, well, I dare ya not to love it. (Spoiler: that’s not possible.)

The salted caramel popcorn cake on a decorative cake stand, with a piece having been cut and placed on a white plate next to the cake stand.

Recommended products + tools

To make things easier for you, here are the products I’ve used and recommend for this recipe! So often, I get asked about what kind of gluten free flour I use or which kind of baking pans are best – and I know that the baking/cooking world can be overwhelming, what with the bazillion different products available out there. Well, no more.

This post has been sponsored by VonShef, but all opinions are my own! (For more information, check out the Disclosure Policy.)

  • I absolutely swear by the VonShef hand mixer to produce the perfect cake batters and the most fluffy buttercream every single time. (If you’re looking for a new hand mixer, here’s the UK link and the US link for the VonShef one!)
  • When it comes to baking, there’s NEVER enough mixing bowls. You know what I mean, right? That’s why I love the VonShef 6 piece mixing bowl set – (a) there are SIX mixing bowls, and (b) they go from a teeny tiny one to an absolutely humongous one!
  • And if you’re fed up with your mixing bowls sliding all over the place when you use them: the VonShef 3 piece mixing bowl set with non-slip silicone bases are the perfect solution! (If you’re looking for a new mixing bowl set, here’s the UK link and the US link to the VonShef ones.)
  • You know how getting the frosting on a cake all smooth and straight can be a bother sometimes? Well, an icing smoother solves the problem easily. The VonShef dough scraper and cutter can actually be used for this exact purpose – and it works like a dream!

Salted Caramel Popcorn Cake (Gluten Free) - [SPONSORED] This salted caramel popcorn cake quite simply will blow your mind. With soft peanut butter sponges, insanely delicious brown butter frosting, an overabundance of salted caramel sauce and a small mountain of caramel popcorn. Plus, it’s gluten free. Sounds rather perfect, doesn’t it? Gluten free cake. Easy cake recipes. Gluten free desserts. Celebration cake ideas. Cake decoration. #glutenfree #cake #dessert #caramel #popcorn #recipe #food
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Salted Caramel Popcorn Cake (Gluten Free)

This salted caramel popcorn cake will blow your mind and set off fireworks on your tastebuds. With pillowy soft peanut butter sponges, insanely delicious brown butter frosting, an overabundance of salted caramel and a small mountain of caramel popcorn. Plus, it’s gluten free. Sounds rather perfect, doesn’t it?

Course Dessert
Cuisine Gluten Free
Keyword birthday cake ideas, brown butter frosting, caramel popcorn cake, gluten free cake recipe, salted caramel cake
Prep Time 1 hour 30 minutes
Cook Time 40 minutes
Chilling Time 2 hours 30 minutes
Total Time 2 hours 10 minutes
Servings 10
Author Kat | The Loopy Whisk

Ingredients

For 3 x 6 inch gluten free peanut butter sponges:

  • 3/4 cup + 1 tbsp (190 mL) milk
  • 6 eggs
  • 3 1/3 cups (400 g) gluten free flour
  • 3/4 tsp xanthan gum
  • 3 tsp baking powder
  • 1 3/4 cups + 2 tbsp (375 g) white sugar
  • 1/2 tsp salt
  • 1 stick (113 g) unsalted butter, room temparature
  • 7/8 cup (225 g) smooth natural peanut butter, room temperature/soft

For brown butter frosting:

  • 4 sticks (450 g) unsalted butter
  • 2 3/4 cups (350 g) powdered sugar
  • pinch of salt

For salted caramel:

  • 1 1/2 cups (300 g) white sugar
  • 3/4 stick + 1 1/2 tbsp (105 g) unsalted butter
  • 3/4 cup + 1 1/2 tbsp (200 mL) double/heavy cream
  • 1/2 - 1 tsp salt

For caramel popcorn:

  • 6 cups (115 g) popcorn
  • 3/4 cup (150 g) white sugar
  • 3 tbsp water
  • 2 tbsp (30 g) unsalted butter
  • 1/2 tsp baking soda

Instructions

For 3 x 6 inch gluten free peanut butter sponges:

  1. Pre-heat the oven to 355 ºF (180 ºC) and line three 6 inch round cake baking tins with baking/greaseproof paper (see post).

  2. In a small bowl, whisk together the milk and eggs until homogeneous.

  3. In a separate larger bowl, sift together the gluten free flour, xanthan gum, baking powder, sugar and salt.

  4. Add the unsalted butter and peanut butter. Using a hand mixer, whisk the butter into the dry ingredients until you get small, pea-sized pieces.

  5. Add the milk+egg mixture and, using a hand mixer, whisk until you get a smooth cake batter.

  6. Evenly distribute the cake batter among the three lines cake tins and smooth out the tops.

  7. Bake in the pre-heated oven at 355 ºF (180 ºC) for 40 - 45 minutes or until an inserted toothpick comes out clean and the cakes are golden brown on top.

  8. Leave the cakes to cool in the cake tins for about 10 minutes, then turn out onto a cooling rack.

  9. Once cool, level off the cakes if they have domed while baking (the cut-offs make for an excellent snack).

For brown butter frosting:

  1. First, brown the butter by first melting it in a pot with tall sides and then cooking it for about 10 - 15 minutes with frequent stirring, until it goes a deep brown colour and starts smelling nutty. The butter will foam, so make sure you use a deep pot.

    Once the butter goes a dark brown butter, remove it from the heat immediately (otherwise it will burn) and pour it into a mixing bowl.

    I recommend using a pot with a light-coloured bottom so that you can follow the changing colour of the butter.

  2. Allow the butter to cool at room temperature or in the fridge until it firms up but is still "spreadable" (see post).

  3. Whisk the cooled and firmed-up brown butter until pale, fluffy and increased in volume.

  4. Add the powdered sugar and whisk for a further 4 - 5 minutes until the frosting is smooth and super fluffy.

For salted caramel:

  1. In a pot, melt the sugar on medium-high heat while constantly stirring, until it is a deep golden brown.

  2. Add the butter, and mix well until the butter has melted and is fully incorporated into the caramel. (Be careful, as the caramel can bubble strongly on the addition of butter!) Allow to cook for 2 - 3 minutes.

  3. Add the double/heavy cream in a slow stream, all the while mixing vigorously. (Be careful, as the caramel can bubble strongly and release steam on the addition of double cream!)

  4. Spoon out a small amount of the caramel sauce, allow it to cool, and check its consistency. If it's too thick, you can add a bit more double/heavy cream, and repeat the process until you reach the desired consistency. (The salted caramel should be quite runny because it will be used for drizzling, but not too much otherwise it will drip all the way down the cake.)

  5. After the final addition of the double/heavy cream, add the salt and allow the salted caramel to cook for 1 minute, then remove from heat and allow to cool completely. 

For caramel popcorn:

  1. Place the popcorn into a large bowl or onto a large baking sheet lined with a silicone mat or aluminium foil.

  2. In a pot, mix the sugar and water, and cook on medium-high heat while constantly stirring, until it is a light amber/golden colour. Don't let the sugar go all the way to a deep golden brown.

    The reason for adding the water here (unlike for the salted caramel sauce) is that we want a more controlled caramelisation of the sugar, as the caramel can burn quickly once the baking soda is added.

  3. Add the butter, and mix well until the butter has melted and is fully incorporated into the caramel. (Be careful, as the caramel can bubble strongly on the addition of butter!) Allow to cook for about 30 seconds.

  4. Add the baking soda and mix quickly – the mixture will bubble up so be careful not to burn yourself.

  5. Quickly pour the bubbling caramel over the popcorn and quickly mix the popcorn + caramel together. Working fast is crucial at this stage, as the caramel gets hard very quickly, and we want all the popcorn covered in an even thin layer of caramel.

  6. Allow the caramel covered popcorn to cool, then break it up into smaller pieces.

Assembling the cake:

  1. Assemble the cake by spreading a generous layer of brown butter frosting on top of a peanut butter sponge. Drizzle with some salted caramel. Then repeat with another layer (see post).

  2. Place the third and final peanut butter sponge of top. Use the remainder of the brown butter frosting to cover the top and sides of the cake. Smooth out the frosting with an icing smoother.

  3. Refrigerate the cake for about half an hour. This will firm up the frosting and ensure that it will stay neat once the salted caramel is drizzled on top.

  4. Spread the salted caramel on top of the cake, and allow it to drip down the sides.

  5. Pile the caramel popcorn on top of the cake. Use the salted caramel to stick the individual pieces together (to make it more stable).

  6. That's it! Enjoy!

Storage:

  1. The salted caramel peanut butter cake keeps well in the fridge in a closed container (or carefully wrapped in cling film) for 3 - 4 days.

Salted Caramel Popcorn Cake (Gluten Free) - [SPONSORED] This salted caramel popcorn cake quite simply will blow your mind. With soft peanut butter sponges, insanely delicious brown butter frosting, an overabundance of salted caramel sauce and a small mountain of caramel popcorn. Plus, it’s gluten free. Sounds rather perfect, doesn’t it? Gluten free cake. Easy cake recipes. Gluten free desserts. Celebration cake ideas. Cake decoration. #glutenfree #cake #dessert #caramel #popcorn #recipe #food Salted Caramel Popcorn Cake (Gluten Free) - [SPONSORED] This salted caramel popcorn cake quite simply will blow your mind. With soft peanut butter sponges, insanely delicious brown butter frosting, an overabundance of salted caramel sauce and a small mountain of caramel popcorn. Plus, it’s gluten free. Sounds rather perfect, doesn’t it? Gluten free cake. Easy cake recipes. Gluten free desserts. Celebration cake ideas. Cake decoration. #glutenfree #cake #dessert #caramel #popcorn #recipe #food Salted Caramel Popcorn Cake (Gluten Free) - [SPONSORED] This salted caramel popcorn cake quite simply will blow your mind. With soft peanut butter sponges, insanely delicious brown butter frosting, an overabundance of salted caramel sauce and a small mountain of caramel popcorn. Plus, it’s gluten free. Sounds rather perfect, doesn’t it? Gluten free cake. Easy cake recipes. Gluten free desserts. Celebration cake ideas. Cake decoration. #glutenfree #cake #dessert #caramel #popcorn #recipe #food

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