Roast Beef Casserole - cooking recipe

Ingredients

1 box Deluxe Kraft macaroni and cheese
1 can cream of mushroom soup
1 can roast beef and gravy (chunky)
1 medium onion
1 Tbsp. butter

Preparation

Cook macaroni by itself.
Saute onion in butter until tender. Drain macaroni.
Add onion, cheese, soup and beef.
Mix well. Cook in a 350\u00b0 oven for 25 minutes.