Cheesy Chicken Pasta Casserole

This is another recipe that I got from work.  I first tried this at my friend Marilyn's son's wedding rehearsal dinner.  (Did that make since?)  She was kind enough to share the recipe with me.  This is a great make ahead meal.  It freezes great too.

Cheese Chicken Pasta Casserole: 

(Marilyn)

6 chicken breasts (cooked and diced)

16 oz. spaghetti

1 stick of butter

1 medium onion

1 can of rotel tomatoes and green chilies

1 can of tomato soup plus ½ can of water

1 small box of Velveeta cheese (cubed)

1 tablespoon garlic powder

1 teaspoon black pepper

Cook and drain pasta.  In a pan, melt the butter and cook the onion until tender.  Add Rotel tomatoes, tomato soup, ½ can of water to onion, gradually add cheese until all melted.  Add the garlic powder and pepper.  Combine chicken, pasta and cheese sauce, mix so everything is combined.