Preheat the oven to 200°C, gas mark 6. Line a 12 hole muffin tin with muffin cases.
Sift the flour into a large bowl and mix in the oats and sugar. In a separate bowl mash the banana and mix in the peanut butter, eggs, butter and milk. Stir into the flour mixture.
Spoon into the muffin cases and bake for 15-20 minutes or until golden. Cool on a wire rack.
For smaller appetites, you could make these tasty treats in regular cupcake cases! The recipe will make 20 and the cooking time will be 12-15 minutes.
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