1 (18.25-ounce) package devil's food cake mix |
1 (3.9-ounce) package chocolate instant pudding mix |
2 cups sour cream |
1 cup butter or margarine, softened |
5 large eggs |
1 teaspoon vanilla extract |
3 cups semisweet chocolate morsels, divided |
1 cup white chocolate morsels |
1 cup chopped pecans, toasted |