Here’s how to prepare and bake a delicious Southwest Chicken Casserole:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish.
2. Mix the Base: In a large bowl, combine the shredded chicken, black beans, corn, diced tomatoes (with their juice), and taco seasoning. Stir until well mixed.
3. Add the Cream: Gently fold in the sour cream to the mixture until evenly distributed.
4. Layer the Casserole: Spoon half of the chicken mixture into the bottom of the prepared baking dish, smoothing it into an even layer.
5. Add Cheese: Sprinkle 1 cup of shredded cheddar cheese over the first layer.
6. Complete the Layers: Top with the remaining half of the chicken mixture, then sprinkle the remaining cheddar cheese on top.
7. Bake the Casserole: Place the baking dish in the preheated oven and bake for 30-35 minutes or until the cheese is bubbly and slightly golden.
8. Cool Before Serving: Remove from the oven and let it rest for 5-10 minutes before serving to allow the layers to firm up slightly.

These steps will lead you to a beautifully baked Southwest Chicken Casserole, bursting with flavor!