Fluffy vanilla cupcake

Ingredients for 12 medium cupcakes:
cake flour 150g (1+1/4 cups)
sugar 130g (2/3 of a cup)
salt 1/4 tsp if you use unsalted butter
butter 150g (2/3 of a cup) (I've used salted)
vanilla 1&1/2 tsp
egg 143g (3 eggs)
baking powder 3g (1tsp)
baking soda 1g (1/2 tsp)

Source : Cooking A Dream