Chocolate Chip-Peanut Butter Cake

1/2 cup butter
1/2 cup sugar
1/2 cup brown sugar
3 eggs -- beaten
1/2 cup peanut butter
3/4 cup light sour cream
1 teaspoon vanilla extract
2 1/2 cups flour
1 teaspoon baking powder
1 teaspoon baking soda
1/2 teaspoon salt
1 cup chocolate chips

Cream butter and sugars. Beat eggs in well. Mix in peanut butter, sour cream, and vanilla. Combine flour, baking powder, soda and salt together and add to creamed mixture. Stir in most of the chocolate chips, reserving some for the top. Spoon mixture into a greased and floured 2 1/2 to 3-quart souffle dish or mold that will fit in your crockpot.

Place a small trivet in the crockpot, place the dish on the trivet, then cover the dish with 4 layers of paper towels. Cover loosely to allow steam to escape and cook on high for about 4 hours. Test with a toothpick for doneness. Cool in pot until dish is cool enough to handle, then transfer to a wire rack to cool completely.