Sausage & Rice Bake

Heat oven to 350°F (175°C). Cook sausage and onion in a large skillet until sausage is brown, breaking up sausage with wooden spoon. Drain off fat. Set sausage mixture aside. Combine uncooked rice, celery and dry soup mix in 2 to 2 1/2-quart casserole. Pour boiling water over mixture in casserole; stir to combine. Spoon sausage mixture evenly over mixture in casserole. Cover. Bake about 50 minutes or until rice is tender. Uncover; stir to combine. Sprinkle with cheddar cheese. Bake about 5 minutes more or until cheese melts.