From Auntie Sue
1/2 lbs cooked pasta
2 cups grated cheddar cheese
1 can cream of mushroom soup
1 small can sliced mushrooms
1 cup mayonnaise
1/4 cup chopped onion
1/4 cup chopped pepper (optional)
buttery cracker crumbs
Combine everything except crackers in casserole dish. Top with cracker crumbs. Bake at 350 first covered for 20 minutes then uncovered for 15 minutes.