Grind oats in a blender to make oat flour.
In a bowl, mix oat flour, baking powder, and cocoa powder.
Add eggs, milk, and honey, and mix well.
Break dark chocolate into small pieces and add to the batter. Mix well.
Pour the batter into a pan or oven-safe dish.
Bake in a preheated oven at 180°C (356°F) for 20 minutes.