Imagine a warm, cheesy dish that brings together the zesty flavors of Mexico in one hearty casserole. This Mexican Chicken Casserole is a comforting meal that’s perfect for busy weeknights or cozy gatherings with friends and family. With tender pieces of chicken, creamy sour cream, and a delightful blend of spices, this dish promises to be a hit at your dinner table. Let’s dive into the details of how to create this flavorful masterpiece!
Why This Recipe Is Reliable

This Mexican Chicken Casserole is not just another recipe; it’s a dependable crowd-pleaser that can be made in a pinch. It utilizes simple ingredients that you probably already have in your pantry and comes together in no time. Whether you’re cooking for a family or meal prepping for the week, this casserole offers flexibility and flavor that everyone will love. Plus, the leftovers are just as delicious, making it a great option for busy days.
Ingredient Rundown
To create this mouthwatering Mexican Chicken Casserole, gather the following ingredients:
- 2 lbs chicken breasts (4 small or 3 medium): The star of the dish, providing a hearty protein base.
- 1 tsp salt (or to taste): Enhances the overall flavor of the casserole.
- 1/4 tsp black pepper (or to taste): Adds a touch of warmth and depth.
- 8 oz shredded Mexican cheese (divided): A melty, cheesy layer that binds all the ingredients together.
- 1 cup sour cream (full fat): Brings creaminess and richness to the dish.
- 14 oz diced green chilis (two 7 oz cans with their juice): Provides a mild heat and a burst of flavor.
- 1 small avocado (diced): Fresh and creamy, perfect for topping.
- 1 roma tomato (diced): Adds freshness and color.
- 2 Tbsp cilantro (chopped): A bright herb that complements the dish beautifully.
Must-Have Equipment
Before diving into the cooking process, make sure you have the following kitchen tools on hand:
- Large skillet: For cooking the chicken and combining the ingredients.
- Baking dish: To layer and bake your casserole.
- Mixing bowl: For combining the sour cream and spices.
- Knife and cutting board: Essential for chopping veggies and chicken.
- Meat thermometer: To ensure your chicken is cooked through to perfection.
Cook Mexican Chicken Casserole Like This

Now, let’s get to the fun part—cooking! Follow these simple steps:
Step 1: Prepare the Chicken
Begin by seasoning your chicken breasts with salt and black pepper. In a large skillet over medium heat, add a splash of oil and cook the chicken for about 6-7 minutes per side, or until the internal temperature reaches 165°F. Once cooked, shred the chicken using two forks or chop it into bite-sized pieces.
Step 2: Mix the Base
In a mixing bowl, combine the shredded chicken, 1 cup of shredded Mexican cheese, sour cream, and half of the diced green chilis (reserve the other half for later). Stir until everything is well incorporated.
Step 3: Layer the Casserole
Preheat your oven to 350°F (175°C). In a baking dish, spread the chicken mixture evenly. Top it with the remaining diced green chilis and the rest of the shredded cheese.
Step 4: Bake
Place the baking dish in the preheated oven and bake for about 25-30 minutes, or until the cheese is bubbly and golden brown.
Step 5: Add Fresh Toppings
Once out of the oven, let the casserole cool for a few minutes. Before serving, top it with diced avocado, fresh roma tomato, and chopped cilantro for a burst of freshness.
Make It Year-Round

This Mexican Chicken Casserole is versatile and can be enjoyed throughout the year. Here are some ideas to customize it for any season:
- Summer: Serve it with a side of fresh corn salad for a light meal.
- Fall: Add roasted butternut squash for a heartier dish.
- Winter: Pair it with warm tortillas and a spicy salsa for comfort.
- Spring: Use fresh spring vegetables like zucchini or bell peppers for a colorful twist.
Behind-the-Scenes Notes
- This casserole can easily be made ahead of time. Simply prepare it up to the baking step, cover, and refrigerate for up to 24 hours.
- Feel free to swap out the chicken for shredded rotisserie chicken to save time.
- If you prefer a vegetarian version, use black beans or chickpeas instead of chicken.
Save It for Later
If you have leftovers, store them in an airtight container in the refrigerator for up to 3 days. You can also freeze portions of the casserole for up to 3 months. Just be sure to let it cool completely before transferring to a freezer-safe container.
Questions People Ask
Can I use frozen chicken breasts?
Yes, you can use frozen chicken breasts, but be sure to thaw them completely before cooking for even results.
Is it possible to make this casserole spicier?
Absolutely! You can add jalapeños, spicy salsa, or use hot diced green chilis for an extra kick.
Can I substitute the sour cream?
Yes, Greek yogurt or a dairy-free alternative works well as a substitute for sour cream.
How do I know when the casserole is done baking?
The casserole is done when the cheese is melted and bubbly, and the edges are slightly golden. A meat thermometer should read 165°F in the center.
Hungry for More?
If you loved this Mexican Chicken Casserole, keep an eye on our blog for more delicious recipes that bring the joy of cooking into your home. Whether you’re in the mood for something creamy, spicy, or packed with fresh ingredients, we have you covered with a variety of flavors and cuisines.
This Mexican Chicken Casserole is bound to become a staple in your recipe repertoire, so gather your ingredients and get ready to enjoy a delicious meal that’s sure to satisfy. Happy cooking!

Mexican Chicken Casserole
Equipment
- Large Skillet
- Baking Dish
- Mixing Bowl
- Knife and cutting board
- Meat Thermometer
Ingredients
- 2 lbs chicken breasts (4 small or 3 medium)
- 1 tsp salt (or to taste)
- 1/4 tsp black pepper (or to taste)
- 8 oz shredded Mexican cheese (divided)
- 1 cup sour cream (full fat)
- 14 oz diced green chilis (two 7 oz cans with their juice)
- 1 small avocado (diced)
- 1 roma tomato (diced)
- 2 Tbsp cilantro (chopped)
Instructions
- Begin by seasoning your chicken breasts with salt and black pepper. In a large skillet over medium heat, add a splash of oil and cook the chicken for about 6-7 minutes per side, or until the internal temperature reaches 165°F. Once cooked, shred the chicken using two forks or chop it into bite-sized pieces.
- In a mixing bowl, combine the shredded chicken, 1 cup of shredded Mexican cheese, sour cream, and half of the diced green chilis (reserve the other half for later). Stir until everything is well incorporated.
- Preheat your oven to 350°F (175°C). In a baking dish, spread the chicken mixture evenly. Top it with the remaining diced green chilis and the rest of the shredded cheese.
- Place the baking dish in the preheated oven and bake for about 25-30 minutes, or until the cheese is bubbly and golden brown.
- Once out of the oven, let the casserole cool for a few minutes. Before serving, top it with diced avocado, fresh roma tomato, and chopped cilantro for a burst of freshness.
Notes
- This casserole can be made ahead by preparing up to the baking step and refrigerating for up to 24 hours.
- Swap chicken with shredded rotisserie chicken to save time.
- For a vegetarian version, substitute chicken with black beans or chickpeas.
- Store leftovers in an airtight container in the refrigerator for up to 3 days or freeze up to 3 months.
- Adjust spiciness by adding jalapeños, spicy salsa, or hot diced green chilis.
