Preheat oven to 400°F. Spray a 3-quart baking dish with cooking spray. If you use a 2-quart dish, the cornbread topping will be slightly thicker and may require a few extra minutes in the oven.
In a large bowl, whisk together condensed soups and milk. Stir in cooked chicken and cheese.
Pour chicken mixture into prepared baking dish.
In a separate bowl, whisk together corn muffin mix, cream style corn, sour cream, egg, and melted butter. Spread evenly over the chicken mixture.
Bake, uncovered, for about 40-45 minutes, or until a toothpick inserted in the center of the topping comes out clean. Tent the casserole loosely with foil if the top starts to get too dark before it’s cooked through. Let stand for about 5-10 minutes, then serve!
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Notes
Baking Dish: You can use either a 2-quart or 3-quart casserole dish for this recipe. If you like a thicker cornbread layer on top, I recommend using the smaller pan.
Check the Topping: Make sure that the cornbread is completely cooked through before you pull the dish from the oven. You don't want to find uncooked cornbread batter in your casserole, so use a toothpick inserted in the very center of the casserole to determine if the topping is set. If the toothpick comes out clean, then you know that the cornbread is done.
Tent with Foil: If your casserole starts to brown too much on top before it's finished cooking, cover it loosely with foil.
Garnish: Add sliced green onion, chopped fresh parsley, cilantro, thyme, or chives for a bright touch of flavor and color.