If you’re craving comfort food with a Tex-Mex twist, this Ultimate Tex-Mex Chicken Casserole is just the thing. Packed with tender shredded chicken, sautéed peppers and onions, a homemade creamy sauce, and layers of melty cheese and corn tortillas, this dish brings big flavor without a lot of fuss. It’s perfect for busy weeknights when you need something hearty, satisfying, and family-friendly.
What sets this recipe apart from other chicken casseroles is the from-scratch sauce. Instead of using canned soups, you’ll whisk together a creamy, seasoned sauce that’s rich and full of depth. Combined with diced tomatoes and green chilies, plus a blend of warm spices like cumin, smoked paprika, and chili powder, this casserole delivers bold, comforting Tex-Mex flavor in every bite.
The best part? This Ultimate Tex-Mex Chicken Casserole is super versatile. Make it as written, or customize with extra veggies like spinach or zucchini. You can also adjust the heat level to suit your taste—add jalapeños for spice lovers or keep it mild for the whole family. Serve it with a side of rice, a simple green salad, or just enjoy it on its own for a satisfying meal that’s sure to become a repeat favorite.
Ingredients:
For the Sauce:
- 3 tablespoons butter
- 3 tablespoons all-purpose flour
- 1½ cups chicken broth
- 1 cup whole milk
- 1 teaspoon smoked paprika
- 1 teaspoon ground cumin
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- ½ teaspoon chili powder
- Salt and pepper, to taste
For the Filling:
- 2 tablespoons olive oil
- 1 medium yellow onion, diced
- 1 red bell pepper, diced
- 1 green bell pepper, diced
- 2 garlic cloves, minced
- 1 (10-ounce) can diced tomatoes with green chilies, drained
- 3 cups cooked, shredded chicken (rotisserie or leftover works great)
- 8 small corn tortillas, torn into pieces
- 2 cups shredded sharp cheddar cheese (or a Mexican blend)
Optional Garnish:
- Fresh cilantro, chopped
- Sliced jalapeños
- Lime wedges
Instructions:
Preheat your oven:
Set oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
Make the creamy sauce:
In a medium saucepan, melt the butter over medium heat. Whisk in the flour and cook for 1–2 minutes to remove the raw flour taste. Slowly whisk in chicken broth and milk until smooth. Stir in smoked paprika, cumin, garlic powder, onion powder, chili powder, and season with salt and pepper. Simmer for 3–4 minutes until thickened. Remove from heat.
Cook the veggies:
In a large skillet, heat olive oil over medium heat. Sauté onion and both bell peppers until soft (about 6–7 minutes). Add minced garlic and cook for another minute. Stir in the drained tomatoes with green chilies and cooked chicken. Pour in the homemade sauce and mix until everything is well coated.
Assemble the casserole:
Layer half the torn tortillas at the bottom of the baking dish. Top with half the chicken mixture, then sprinkle with half the cheese. Repeat with remaining tortillas, chicken mixture, and cheese.
Bake:
Cover with foil and bake for 25 minutes. Uncover and bake for an additional 10–15 minutes, until the cheese is melted and bubbly.
Serve:
Let cool for 5–10 minutes before serving. Garnish with cilantro, jalapeños, or a squeeze of lime for extra flavor.