Preheat oven to 375°. Spray a 10-inch round baking dish with cooking spray.
In a large bowl, stir together chicken, tomatoes, cheese, sour cream, cilantro, onion, jalapeño, cumin, and lime juice.
In another large bowl, whisk together muffin mix, milk, and egg. Stir chicken mixture into muffin mixture until well combined. Pour mixture into prepared pan.
Bake until golden brown, about 30 minutes. Let stand for 5 minutes before serving. Serve with toppings.
Notes
Kitchen Tip: If you have a favorite cornbread recipe, omit the corn muffin mix, milk, and egg, and stir the chicken mixture into your own cornbread batter; bake as directed.
*We used Jiffy Corn Muffin Mix.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/chicken-cornbread-casserole-recipe/