Grease a 26 cm baking dish with butter and sprinkle with flour, put in the refrigerator.
Sift flour, baking powder and cocoa into a bowl. Beat eggs with regular and vanilla sugar with a mixer until fluffy. Turning the mixer on the lowest speed, add the flour.
Separately, beat the softened butter until soft and creamy. Slowly fold the butter into the egg-flour mixture. Add beer, mix until smooth and pour the dough into the prepared form.
Bake the cake in an oven preheated to 180 ° C for 60-70 minutes. Remove from oven and cool completely.
For cream, beat cream cheese with powdered sugar and decorate the top of the cooled cake with it.