Macaroni Casserole

Ingredients

• 1 (8 oz.) box macaroni, cooked
• 1 1/2 c. grated sharp cheese
• 1 onion, chopped
• 1/2 c. mayo (can use lite)
• 1/2 c. green peppers, chopped
• 1 can water chestnuts, sliced
• 2 cans cream of mushroom soup
• 1 small jar sliced pimento (optional)
• 1 stick butter
• cracker or bread crumbs