Wash and drain the blackberries. Preheat the oven to 220 ° C.
Beat the eggs with 2 tablespoons of powdered sugar. Add the flour and milk and stir well so that an almost liquid dough is formed.
Butter an ovenproof dish and add the blackberries. Pour the batter over it. Put the pan in the preheated oven. After 20 minutes of baking time, sprinkle with the remaining powdered sugar and bake for another 15 minutes.