Cappuccino & Chocolate Cupcakes

Bahan-bahan (24 porsi)

• 1 (13,25 ons) campuran kue kuning kotak ((ditambah bahan untuk membuat adonan))
• 2 tablespoons butiran kopi instan
• 2 teaspoons hot water
• 4 ounces semi-sweet chocolate, (finely chopped)
• 1 ⅓ cups gula pasir
• 5 large egg whites
• ½ teaspoon cream of tartar
• 2 ounces semi-sweet chocolate, (finely grated)