Divide and press biscuit dough across the bottom and up the sides of 10 greased muffin cups; set aside. Combine ground beef, 1/2 cup catsup, onion, egg and oats in a medium mixing bowl; mix well. Form into 10 balls; place one in each biscuit cup. Spread remaining catsup on the tops; sprinkle with cheese. Bake at 350 degrees for 30 minutes.