Mix the flour, oats, baking powder, baking soda and salt. In a separate bowl break the egg and gently mixed, and then thereto were added milk and the oil. Stir well and add vanilla and mashed bananas. The flour mixture was poured into a banana and it is mixed thoroughly, preferably with a mixer to obtain a smooth dough. Distribute in aluminum shapes, which bottoms are covered in advance with baking paper. Cupcakes bake about 20 minutes in a preheated 200 ° C oven.