This was one of the recipes for a food feature about buttermilk. Buttermilk lends a fantastic texture and taste to baked goods. I don't know why we don't use it as much anymore. Anyway, I like this cake recipe because it makes a good, fairly impressive cake to take to a family or church picnic. The layers make people think you are really talented. But it's not that hard...the bottom layer is thick enough from adding the cocoa that it's not really that much of a challenge to spread the yellow layer over top.
1 package vanilla cake mix
1 1/4 cups buttermilk or sour milk
1/2 cup (1 stick) butter, softened
4 eggs at room temperature
1 cup white chocolate chips, divided
1/2 cup unsweetened cocoa powder
1 1/2 cups semi-sweet chocolate chips, divided
Preheat oven to 350 degrees. Line a 9 x 13-inch baking pan with non-stick foil or grease liberally with butter.
In a large bowl, combine the cake mix, buttermilk, softened butter, and eggs. Beat on low speed only until combined. Some small lumps may remain. Pour half of the cake batter into a separate bowl and set aside.
To one half of the cake batter, fold in 1/2 cup white chocolate chips, reserving the remaining 1/2 cup for later use.
To the other half of the cake batter, add the cocoa powder, mixing until combined. Fold in 1/2 cup semi-sweet chocolate chips, reserving the remaining 1 cup for later use.
Pour the dark chocolate batter into the prepared pan and smooth to even it out.
Carefully spoon the vanilla cake batter on top of the dark chocolate layer. Gently spread to an even layer without disturbing the bottom layer.
Bake 35 to 40 minutes, until a toothpick inserted in the center comes out clean.
Remove from oven and immediately sprinkle the top of the cake with the reserved 1 cup of semi-sweet chips. Wait 5 minutes, then use a spatula to spread the melted chocolate on the top as a frosting. Let the cake cool to room temperature. Sprinkle the reserved 1/2 cup of white chips on top and gently press them into the frosting.