Heat oven to 350°F. Spray 13” x 9” metal baking pan with cooking spray. For meatloaf, combine all meatloaf ingredients in large bowl; mix lightly but thoroughly. Press mixture into pan. Bake 30 to 35 minutes or until meatloaf is to medium doneness (160°F) and center is no longer pink. Drain off any juices. Heat broiler. For secret sauce, combine ingredients in small bowl; mix well. Spread over hot meatloaf, completely covering; cut meatloaf into 8 rectangles. (Do not remove from pan.) Top each rectangle with cheese, 2 half pieces bacon and tomato slices. Broil meatloaf 5 to 6 inches from heat source 2 to 3 minutes or until cheese melts. Serve, if desired, on bun or bread.