Brown the ground beef. Drain off grease. Add barbecue sauce; heat through.
Mix Bisquick with milk. Stir until thoroughly mixed. If mixture is dry, add a little milk. If it's wet, add a little Bisquick. Dough should be stiff. Press Bisquick mixture into oblong glass pan. Be sure to flour fingers as you go or it will stick to you. Shape it up around the side like a pie crust. Pour in beef mixture. Top with cheese. Bake at 450 degrees F for about 1/2 hour or until biscuit is browned. Sharp cheese may be used instead of mozzarella.