Pre-heat the oven to 180 ºC (350 ºF) and line a cupcake baking tray with 12 cupcake cases.
Bake in the pre-heated oven at 180 ºC (350 ºF) for about 20 minutes or until golden brown and an inserted toothpick comes out clean.
Note 1: Coating the blueberries in flour ensures that they don't all sink to the bottom of the cupcakes.
Note 2: To achieve the piping decoration as in the pictures above, keep the piping bag vertically above each cupcake. Start piping so that the nozzle is about 1 cm (about 1/2 inch) above the cupcake, and then slowly raise the nozzle as you continue piping. When the buttercream is at the height you want, stop piping and quickly "pull" the nozzle up to get the sharp peak on top.Ta-da!