Mix the flour, baking powder, butter and sugar.
Add the milk, vinegar, vanilla and mix.
Beat the batter smooth. Transfer onto the muffin moulds.
Microwave for 2 minutes. Turn container round and bake another 2 minutes.
Turn around again and bake 1 minute. Let stand for 5 minutes then take out of the oven.
Key Ingredients: All purpose flour, baking powder, butter, icing sugar, vinegar, sugar, milk