Pour the sugar into a bowl and add the softened butter.
Beat with a mixer until creamy.
Add one egg at a time, beating with a mixer.
Sift the flour with cocoa and baking powder.
Combine the butter and flour mass.
Beat with a mixer. The dough is ready.
For the filling, combine cottage cheese, eggs, sugar and starch in a container.
Punch with an immersion blender until smooth.
Cover the baking dish with foil or parchment. Spread out 3/4 of the dough.
Top with the curd filling.
Spread the rest of the dough on top of the filling and make streaks with a match or toothpick. Cook in the oven, preheated to 180 degrees, 35-40 minutes.