**Preheat the oven** to 375°F (190°C). Lightly grease a 9x13-inch baking dish and set aside.
**Cook and shred the chicken**:
- If your chicken breasts aren’t already cooked, you can poach or bake them until fully cooked through. Shred the cooked chicken using two forks.
**Prepare the creamy mixture**:
- In a large bowl, combine the softened cream cheese, sour cream, garlic powder, onion powder, salt, and pepper. Mix until smooth and well-combined.
**Mix in the chicken and jalapeños**:
- Fold in the shredded chicken, cheddar cheese, mozzarella cheese, and diced jalapeños. Make sure everything is evenly distributed.
**Assemble the casserole**:
- Transfer the mixture to the prepared baking dish and spread it out evenly.
**Add the topping**:
- Sprinkle the additional cheddar and mozzarella cheese evenly over the top of the casserole.
- If using Panko breadcrumbs, mix them with the melted butter and sprinkle them on top of the cheese for an extra crispy texture.
**Bake the casserole**:
- Place the casserole in the preheated oven and bake for 20-25 minutes, or until the cheese is melted and bubbly, and the topping is golden brown.
**Cool and serve**:
- Let the casserole rest for about 5 minutes before serving. This allows the flavors to settle and makes it easier to slice and serve.
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### Prep Time:
- 20 minutes
### Cook Time:
- 25 minutes
### Total Time:
- 45 minutes
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### Nutrition (per serving):
- Calories: 420
- Protein: 30g
- Carbohydrates: 6g
- Fat: 30g
- Fiber: 1g
- Sugar: 2g
This **Jalapeño Popper Chicken Casserole** is the perfect blend of creamy, cheesy, and spicy in one bite. It's an excellent dish for dinner parties or weeknight meals and pairs wonderfully with a side of salad or roasted vegetables. For those who prefer a little less heat, simply reduce the amount of jalapeños or opt for the milder variety.