Crunchy Chicken Casserole

Ingredients

• 1 cup chopped celery
• 1 tablespoon butter
• 2 cups cubed cooked chicken
• 1-1/2 cups cooked rice
• 1 can (10-3/4 ounces) condensed cream of chicken soup, undiluted
• 3/4 cup mayonnaise
• 1 can (8 ounces) sliced water chestnuts; drained
• 1/2 cup sliced almonds
• 2 tablespoons chopped onion
• Salt and pepper to taste
• TOPPING:
• 1 tablespoon butter, melted
• 1/2 cup crushed cornflakes
• Sliced almonds, optional