3g vanilla extract / Separate the egg yolks, add all ingredients except stevia and egg whites, whisk egg whites into a meringue and fold in gently (mix from bottom to top so the meringue doesn't collapse) / 160-170°C
Mix oatmeal, protein powder, baking powder, and cocoa powder in a bowl.
Add eggs and milk, and make a dough.
Finely chop dark chocolate and mix it into the dough.
Put the dough into muffin tins or oven-safe containers.
Bake in a preheated oven at 180°C for 15-20 minutes.
Let cool before serving.