In a large bowl, combine brown sugar, barbecue sauce, salsa, molasses, oregano, mustard and cumin. Add undrained pork and beans, drained pinto beans, drained kidney beans, onion and bacon; stir gently to combine.
Transfer bean mixture to a 2-1/2- to 3-quart casserole. Bake, uncovered, in a 325 degree F oven for 2-1/2 to 3 hours or until desired consistency, stirring occasionally. Beans will thicken as they cool. Makes 12 side-dish servings.
Prepare bean mixture as above. Transfer to a 4-1/2- to 6-quart slow cooker. Cover and cook on low-heat setting for 5 to 6 hours or on high-heat setting for 2-1/2 to 3 hours.