Ritzy Chicken Casserole

Ingredients 7 ounces Ritz crackers (about 2 sleeves /60 crackers) 4 ounces melted butter (1 stick, divided) 1 (10 3/4-ounce) can condensed  cream of chicken soup (or cream of mushroom) 1 (8-ounce) container sour cream  (about 1 cup, regular or reduced fat) 1/2 cup  chicken broth (low sodium or unsalted) 1 1/2 pounds boneless chicken breast halves (4 medium, cooked and diced)*…