2 cups butter, melted
2 cups white sugar
2 1/2 cups packed light brown sugar
2 eggs, beaten
1 teaspoon vanilla extract
1 (17 ounce) can vanilla flavored cake mix
1 3/4 cups all-purpose flour
1/4 teaspoon baking soda
1/4 teaspoon salt
1 teaspoon ground cinnamon
1/8 teaspoon ground nutmeg
1 (1 ounce) square unsweetened chocolate, chopped
Preheat oven to 350 degrees F (175 degrees C). Grease and flour two 9-inch round cake pans.
In a large bowl, cream together the butter or margarine, brown sugar, brown sugar, eggs, vanilla extract and cake mix until smooth. Beat in flour, baking soda, salt, cinnamon, and nutmeg. Mix in chocolate. Cut milk chocolate into cubes.
Pour batter into prepared pans. Bake at 350 degrees F (175 degrees C) for 20 to 25 minutes or until a toothpick inserted in the center of the cake comes out clean. Cool for 10 minutes in the preheated oven.