1 lb. ground beef
1 med. onion
1 sm. can tomato sauce
1 pkg. taco seasoning mix or spaghetti sauce mix
1 can crescent rolls
8 oz. sour cream
2 c. Mozzarella cheese

Brown ground beef and onion. Add tomato sauce and taco seasoning. Put 4 crescent rolls in bottom of casserole. Add hamburger mixture, sour cream and cheese. Lay other 4 crescent rolls on top. Bake at 350 degrees for 30 to 40 minutes. Let stand 5 minutes before cutting.