Add the remaining ingredients and mix everything. Cover and bake at 350 degrees for 1 hour, stirring half way through. Uncover and bake for an additional 10 minutes or until the sauce thickens.
1/4 cup Brown Sugar, 1/4 cup Granulated Sugar, 1/4 cup Ketchup, 1/3 cup BBQ Sauce, 2 Tbsp Molasses, 1 tsp Chili Powder, 1/2 tsp Black Pepper, 1/2 tsp Salt, 2 Tbsp Ground Mustard, 1 16 oz Butter Beans, 1 20 oz Pork and Beans, 1 16 oz Red Kidney Beans