Melt the butter in a microwave oven. Beat the sugar and melted butter with a mixer until whitened.
Add the eggs 1 by 1, while beating with the mixer until the cream becomes fluffy.
In another bowl, whip the egg with the powdered sugar and cottage cheese until homogeneous. Pour it into a pastry bag and spray it out in a spiral on top of the brown mixture in the oven dish.
Bake the cake at a moderate temperature for about 45 min. Check to see if it's ready with a toothpick.