Put the oatmeal, egg whites and honey in a bowl and stir these ingredients with a spoon. Then grease four muffin cases with butter and pour in the batter.
Press in the cereal bar muffins at the top so that you can add the Greek yoghurt later. Bake the muffins for about 15 minutes at 160 ° C top / bottom heat.
Pour the Greek yogurt into the indented hollows and garnish with bananas and blueberries.