1 (6 1/2 oz.) can tuna
1 c. uncooked macaroni
1 c. shredded Cheddar cheese
1 (4 oz.) can mushrooms (drained)
1 can cream of mushroom soup

Cook macaroni as directed. Drain and combine all ingredients. Mix well. Bake at 350 degrees uncovered for 1 hour. Serves 6 to 8.