crescent chicken casserole

Ingredients

• 1/2 cup chopped celery
• 1/2 cup chopped onion
• 3 tablespoons butter
• 3 cups chicken, cooked and chopped
• 1(8oz) - can water chestnuts,drained
• 1 can cream of chicken soup
• 1(4oz) - can sliced mushrooms,drained
• 1/2 cup mayonnaise or yogurt,plain
• 1/4 cup sour cream
• 1(8oz) - package crescent rolls
• - topping:
• 3 tablespoons butter
• 1 cup cheddar cheese, shredded
• 1/2 cup almonds, slivered