Creating Jalapeno Buffalo Chicken Casserole is simple and enjoyable. Follow these steps for a delicious outcome:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Mix Ingredients: In a large mixing bowl, combine the shredded chicken, cooked rice, chopped jalapenos, buffalo sauce, softened cream cheese, sour cream, garlic powder, onion powder, salt, and black pepper. Mix well until everything is evenly coated.
3. Prepare Baking Dish: Grease a 9×13-inch baking dish lightly with cooking spray.
4. Transfer Mixture: Pour the chicken and rice mixture into the prepared baking dish. Spread it evenly.
5. Top with Cheese: Sprinkle the shredded mozzarella cheese over the top of the casserole.
6. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the cheese is bubbly and golden.
7. Cool: Once baked, remove the casserole from the oven and let it cool for 5-10 minutes before serving.
8. Garnish: Optionally, garnish with additional sliced jalapenos or fresh herbs for extra flavor and presentation.

These straightforward steps ensure that you can whip up this incredible casserole with ease.