Macaroni And Cheese

Ingredients:
- 1 pkg. sea shell macaroni
- 1 Tbsp. margarine
- 1/4 c. chopped onion
- 1 (2 oz.) jar diced pimento, drained
- 2 c. (8 oz.) shredded Cheddar cheese
- 1 (10 oz.) can cream of mushroom soup
- 1/2 c. mayonnaise
- 1 (2 oz.) jar sliced mushrooms, drained

Directions:
- Cook macaroni according to package directions and drain.
- Melt butter in small skillet; add onion and pimento.
- Saute until onion is tender.
- Combine macaroni, onion, mixture and remaining ingredients.
- Mix well.
- Spoon in lightly buttered casserole. Bake at 350° for 30 minutes.