Preheat your oven to 375°F (190°C) and grease a 9x13-inch baking dish.
In a large mixing bowl, combine shredded chicken, instant rice, cream of chicken soup, sour cream, frozen bell peppers, diced tomatoes, chicken broth, and fajita seasoning. Mix well.
Pour the mixture into the prepared baking dish, spreading it evenly.
Sprinkle shredded Mexican blend cheese over the top.
Cover with foil and bake for 25 minutes.
Remove the foil and bake for another 10 minutes until the cheese is bubbly and golden.
Let it rest for 5 minutes before serving.
Serve hot with your favorite sides.