Grind the oatmeal finely into powder.
Wash the strawberries thoroughly and chop them finely.
Mix eggs, Greek yogurt, and stevia to make a batter.
Add the oat powder and baking powder to the batter and mix.
Gently fold the chopped strawberries into the batter.
Pour the batter into an oven-safe mold.
Top with cocoa powder or unsweetened dark chocolate.
Bake in a preheated oven at 180°C for 20–25 minutes.
After cooling, cut into desired sizes.