Yield: 12 - 16 servings
Preheat oven to 350 degrees. Grease and flour 13x9 inch pan. Prepare cake mix as directed on package. Stir in 1/2 cup white chocolate chips and 1 cup semisweet chips. Pour into prepared pan. Bake 35 to 40 minutes or until toothpick inserted in center comes out clean.
Remove from oven; sprinkle top with remaining 1/2 cup white chocolate chips. Serve warm or cool completely in pan.
Please note that some ingredients and brands may not be available in every store.