chicken and water chestnut casserole

Ingredients

• 4 medium chicken breasts, boiled, deboned, and chunked
• 1 can cream of chicken soup
• 1 tablespoon minced onions
• 1/2 teaspoon salt
• 1 can sliced water chestnuts, drained
• 3/4 cup mayonnaise
• 1 cup finely minced celery
• 1 cup cooked instant rice
• 1 tablespoon lemon juice
• TOPPING:
• 1 cup crushed plain potato chips
• 1/4 cup melted butter