Marble Cake, a recipe from Gourmetpedia

Ingredients

• - 3 eggs
• - 150 g (5 oz.) butter
• - 150 g (5 oz.) powdered sugar
• - 150 g (5 oz.) flour
• - 1 Tbsp. baking powder
• - 1 packet vanilla sugar
• - 80 g (3 oz.) unsweetened cocoa