Place the oats into a blender and blend until the texture resembles coarse flour. Whisk together the blended oats, wholemeal flour, plain flour, brown sugar, powdered milk, baking powder, bicarb and salt in a bowl; set aside.
Whisk together the egg, milk, vegetable oil and vanilla. Stir in the mashed banana. Pour the egg mixture into the flour mixture and stir just until moistened. Let the batter stand for 5 minutes.
Heat a lightly oiled frying pan over medium-high heat. Drop batter by large spoonfuls onto the pan, and cook until bubbles form and the edges are dry, about 2 minutes. Flip, and cook until browned on the other side. Repeat with remaining batter.
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