Heat oven to 200c

Lay 12 muffin cases into a tin

Mix the flour, oats, sugar, baking powder, bicarbonate of soda and salt in a bowl

In a larger bowl, lightly beat the egg

Stir in the milk, oil and vanilla.

Add the mashed banana and combine thoroughly. Stir the flour mixture into the banana mixture until just mixed

Pour the batter into the cases

Bake for about 20 minutes

Cool on the tin for 5 minutes, then put on a wire rack to finish cooling