Preparation - Brown ground beef in a skillet. Stir in beans, gravy and barbecue sauce. Spray a 2 quart shallow baking dish with non-stick cooking spray. Pour mixture in into the baking dish. Prepare the corn muffin mix according to the package directions. Drop the batter by spoonfuls on top of the beef mixture. Bake 375° for 25 to 30 min. or until the cornbread is light golden brown.