Step 1

Set your oven to 350°F (175°C). Grease a 9×13 inch baking dish.

Step 2

In a large bowl, mix together chicken, sour cream, cream of chicken soup, milk, celery, onion, salt, and pepper.

Step 3

Spread the chicken mixture evenly in the prepared dish.

Step 4

Combine crushed Ritz crackers with melted butter until well coated.

Step 5

Evenly sprinkle the cracker mixture over the chicken base.

Step 6

Cook in the preheated oven for 30-35 minutes, until the topping is golden and the casserole is bubbly.

Step 7

Allow the casserole to cool slightly before serving to let the flavors meld and the dish to set.