1 lb. box spaghetti, cooked and drained
1 lb. ground beef, cooked and drained
1 lb. jar Ragu or Prego spaghetti sauce
1 c. cheddar cheese, grated
1 c. mozzarella cheese, grated

Mix spaghetti, beef and sauce together. Pour into a 9 x 13 inch pyrex dish. Top with cheddar and mozzarella cheese. Bake at 350° until cheese melts.