Mix eggs, sugar and butter or margarine until frothy. Mix the flour and baking powder and stir in in portions until a smooth dough is formed. Add egg liqueur and chocolate sprinkles. Stir everything again. Put the dough in a greased box or Gugelhupf pan.
Bake in a preheated oven at 175 ° C for about 1 hour.
After baking, pour either powdered sugar or chocolate icing on top, if desired.