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Mash the banana.
Mix oat flakes, cocoa powder, protein powder, baking powder, and salt together.
Add egg and milk to the mashed banana and mix well.
Combine the dry and wet ingredients to make a batter.
Pour the batter into an oven-safe pan.
Top with chocolate chips.
Bake in a preheated oven at 180°C (356°F) for 20 minutes.
