In a medium bowl, break the banana into small pieces.
Add the cottage cheese.
Add the eggs.
Add the oat flakes.
Sprinkle with a pinch of salt and add the teaspoon of baking powder.
Blend everything together until smooth.
The mixture should have a thick, completely homogeneous consistency.
Prepare a muffin tin and lightly grease the cups with melted butter. Fill each cup about two thirds full, because the muffins will rise slightly as they bake.
Bake in a preheated oven at 170 °C (340 °F) for 18–20 minutes.
The banana oat muffins are ready. If you like, dust them with a little powdered sugar before serving. Enjoy.
Notes
Use a very ripe banana with brown spots on the peel, as it will make the muffins sweeter and more flavorful without adding sugar.
If the batter looks too thick to pour, add 1–2 tablespoons of milk or yogurt to adjust the consistency, but do not make it runny.
Do not overbake the muffins; check them after 18 minutes and remove them as soon as a toothpick comes out clean, so they stay soft and moist.
You can mix in a small handful of chopped nuts, berries or dark chocolate chips to change the flavor, but keep the total quantity modest so the texture stays light.
Let the muffins cool in the pan for a few minutes, then transfer them to a wire rack; this prevents condensation and keeps the edges from becoming soggy.