Preheat your oven to 375°F.
Feel free to chat while it heats up!
In a mixing bowl, combine cream of chicken soup, diced tomatoes, taco seasoning, and sour cream.
Mix well to create a smooth sauce.
Layer the bottom of a 9x13-inch baking dish with half of the tortillas.
Add half of the cooked chicken, sauce, and shredded cheese.
Repeat the layers.
Cover the casserole with aluminum foil and bake for 20 minutes.
Remove the foil and bake for an additional 10 minutes to melt the cheese.
Let the casserole cool for a bit before serving.
This makes it easier to cut and serve.