Place bacon in 3-quart glass baking dish. Microwave on high for 4 minutes or until crisp; drain and reserve drippings. Crumble and set aside. Add onions to bacon drippings. Microwave for 3 minutes; stirring once. Add drained beans and undrained pork and beans to onions; mix well. Microwave covered on medium for 30 minutes; stirring once. Let stand for 10 minutes. Sprinkle crumbled bacon over top. Yields 12 servings.