Kue Campuran Kue Coklat Ganda

Bahan-bahan (15 porsi)

• ½ cup butter
• 1 egg
• 1 packet instant coffee dissolved in 2 tablespoons water
• 1 tablespoons oil
• 1/2 teaspoon vanilla
• 1 box chocolate cake mix
• 1 ½ cup chocolate chips
• 1 ½ cup white chocolate chips