Preheat oven to 375°F (190°C). Grease a 9x13-inch baking dish.
Season chicken breasts with salt and pepper, then place them in the baking dish.
In a bowl, mix crushed Ritz crackers, Parmesan cheese, and melted butter.
Spread sour cream over the chicken in the dish. Combine cream of chicken soup and chicken broth, and pour over the chicken. Top with the Ritz cracker mixture.
Bake for 35-40 minutes until chicken is cooked through and topping is golden brown.
Let the casserole rest before serving. Garnish with parsley if desired. Serve hot.
