creamy country chicken casserole

Ingredients

• 3 cups - cooked diced chicken, (1 whole stewed chicken, or 3-4 boneless skinless breasts, or can sub rotisserie)
• 1 cup - diced water chestnuts
• 1 (4 oz.) - can mushrooms, drained
• 1/2 cup - chopped or thinly sliced celery
• 1/2 - small onion (1/4 cup) finely chopped
• 4 - hard-boiled eggs, diced
• 1/2 cup - mayo
• 1 can - cream of chicken soup
• 6 Tbl. - melted butter
• 1 1/2 cups - crushed "chicken in a biskit" crackers, or ritz or club