1 (8 oz.) pkg. macaroni
1 tbsp. mayonnaise
1 can (10 3/4 oz.) cream of mushroom soup
1 (4 oz.) can mushrooms with liquid
1/4 c. onion, chopped
1 green pepper, chopped
1 sm. jar diced pimentos
1 c. grated Cheddar cheese

Cook macaroni according to package directions and drain. Mix with rest of ingredients and pour into greased casserole dish. Bake at 350 degrees for 30 minutes.