Hot Chicken Salad Casserole
["2 c. cooked, cubed chicken breasts", "1 c. cooked rice (use package directions)", "1 (4 oz.) can sliced mushrooms (optional)", "1 Tbsp. lemon juice", "1 Tbsp. salt", "1 (8 oz.) can drained, sliced water chestnuts", "1 c. finely chopped celery", "3/4 c. mayonnaise", "2 Tbsp. chopped onion", "1 (10 3/4 oz.) can chicken soup", "4 oz. Mozzarella cheese, grated", "1/4 c. crushed Ritz crackers", "3/4 c. crushed Ritz crackers", "1/2 c. slivered almonds", "1/4 c. melted margarine"]
["Bake uncovered 45 minutes at 350\u00b0."]
["chicken breasts", "rice", "mushrooms", "lemon juice", "salt", "water", "celery", "mayonnaise", "onion", "chicken soup", "Mozzarella cheese", "crackers", "crackers", "almonds", "margarine"]