Ingredients
1 package white cake mix (regular size)1-1/4 cups water3 egg whites1/3 cup canola oil1 teaspoon vanilla extract3 ounces white baking chocolate, meltedFILLING:3/4 cup semisweet chocolate chips2 tablespoons butterFROSTING:1 can (16 ounces) vanilla frosting3 ounces white baking chocolate, melted1 teaspoon vanilla extract1 carton (8 ounces) frozen whipped topping, thawed
Preparation
In a large bowl, combine the cake mix, water, egg whites, oil and vanilla. Beat on low for 30 seconds. Beat on medium for 2 minutes. Stir in white chocolate.
Pour into a greased 13x9-in. baking pan. Bake at 350° for 25-30 minutes or until a toothpick inserted in the center comes out clean. Cool for 5 minutes.
Meanwhile, in a microwave, melt chocolate chips and butter; stir until smooth. Carefully spread over warm cake. Cool completely.
In a small bowl, beat frosting until fluffy; beat in white chocolate and vanilla until smooth. Fold in whipped topping; frost cake. Store in the refrigerator.
