Life and Death Chicken and Rice casserole

Why I Love This Recipe
I give this casserole to friends and family whenever they have a birth or death in the family, thus the name "Life and Death" casserole.
Ingredients You'll Need
• 4 cups cooked chicken breast (diced)
• 1 pkg. Uncle Ben’s Wild & Long Grained Rice, 5 Minute recipe (cook according to pkg.)
• 1 can French-style green beans (drained)
• 1 medium jar pimentos (chopped)
• 1 small onion (chopped)
• 1 ½ cups grated cheddar cheese
• 1 can cream of celery soup
• 1 can sliced mushrooms (drained)
• 1 cup mayonnaise
• 1 ½ cups Pepperidge Farm herb seasoned stuffing mix
• 1 stick margarine (melted)
Directions
Mix all ingredients except stuffing and margarine. Place in a 9 x 13 pan.
Mix stuffing with melted margarine. Sprinkle over casserole.
Bake at 350° uncovered for 45 minutes.