Mix ground oats, cocoa powder, sweetener, salt, and baking powder together.
Add 48g yogurt and mix until crumbly.
Add 24g yogurt and knead into a dough.
Add chocolate pieces.
(Brush a little milk on top) Preheat oven to 170°C for 5-10 minutes.
Bake at 170°C for 10-15 minutes.