Chicken Mac & Cheese Casserole

3 chicken breast (cooked and chopped)
1 can cream of chicken soup
1 cup of mayo
1 box of deluxe macaroni and cheese
1 small onion (diced)
Salt and pepper (judge by taste)

Cook macaroni and cheese, mix it up, add other ingredients
Pour into casserole dish
For topping, 1 sleeve of Ritz or Townhouse crackers, mixed with melted butter and pour on top of casserole
Bake at 350 degrees until bubbly (30-45 minutes)