Chicken and Rice Casserole

2 (14 1/2-ounce) can green beans, rinsed and drained
3 cups diced cooked chicken
1 medium onion diced and sauteed
1 (8-ounce) can water chestnuts, drained and chopped
1 (4-ounce) can pimentos
1 (10 3/4-ounce) can condensed cream of celery soup
1 cup mayonnaise
1 (6-ounce) box long-grain and wild rice, cooked according to package directions
1 cup grated sharp Cheddar
Pinch salt

Preheat oven to 350 degrees F.

Mix all ingredients together and pour into a greased 3-quart casserole dish. Bake for 20 to 25 minutes or until bubbly.