8 oz. pkg. spiral macaroni, cooked
12 oz. grated cheese
1 c. mayonnaise
2 oz. chopped pimento
1 c. chopped onions
2 oz. can mushrooms, drained
1 can cream of mushroom soup

Cook macaroni according to package directions, drain and add cheese. Combine all other ingredients and place in casserole dish. Top with Ritz crackers in melted butter. Bake at 350 degrees for 45 minutes.