Introduction
Don’t let the playful name fool you—this Mexican Trash Casserole (often called Fiesta Chicken Casserole) is one of the most delicious, crowd-pleasing weeknight dinners you will ever make. It is a brilliant comfort food mashup that combines the satisfying crunch of Nacho Cheese Doritos with juicy shredded chicken, a velvety sour cream sauce, and a molten blanket of melted cheese.
The beauty of this dish lies in its contrast of textures and explosive flavors. It requires almost zero actual cooking prep, making it the perfect solution for busy nights when you need a hot, comforting meal on the table in under 30 minutes. Whether you are feeding picky kids or hosting a casual game-day gathering, this dish is guaranteed to be completely cleared out of the pan.
Full Recipe: Easy Mexican Trash Casserole
- Prep Time: 10 minutes
- Cook Time: 20 minutes
- Total Time: 30 minutes
- Yields: 6–8 servings
Ingredients
- 1 bag (approx. 9–10 oz) Nacho Cheese Doritos, roughly crushed
- 2 cups cooked chicken, shredded (rotisserie chicken works perfectly)
- 1 can (10.5 oz) cream of chicken soup
- ½ cup sour cream
- 1 can (10 oz) Rotel diced tomatoes and green chiles, drained
- 1 packet (1 oz) taco seasoning mix
- 2 cups Mexican blend or Cheddar cheese, shredded and divided
Instructions
- Preheat & Prep: Heat your oven to 350°F (175°C). Lightly coat a large 9×13-inch glass baking dish with non-stick cooking spray.
- Crush the Base: Roughly crush your bag of Nacho Cheese Doritos. Pour about half of the crushed chips into the bottom of the prepared glass dish to form a crunchy base layer.
- Mix the Chicken Filling: In a large mixing bowl, combine the shredded chicken, cream of chicken soup, sour cream, drained Rotel tomatoes, and the taco seasoning packet. Stir everything together until the chicken is thoroughly coated in the rich, creamy sauce.
- Stir in Cheese: Fold 1 cup of the shredded cheese directly into the chicken mixture.
- Assemble the Layers:
- Spoon the creamy chicken filling evenly over the top of the crushed Doritos in the baking dish. Use a spatula to smooth it into a level layer.
- Scatter the remaining crushed Doritos evenly across the top of the chicken mixture.
- Finish by blanketing the top with the remaining 1 cup of shredded cheese.
- Bake: Place the casserole uncovered into the preheated oven and bake for 20 minutes. The chicken mixture should be piping hot and bubbly around the edges, and the cheese topping completely melted and golden brown.
- Serve Hot: Remove from the oven and let it sit for 5 minutes to settle slightly before cutting into large, steaming squares.
Conclusion
This casserole is a certified dinner win because it masterfully locks in flavor while keeping your kitchen clean and your cooking time short. Using pre-cooked rotisserie chicken cuts your prep down to mere minutes, while the Doritos base infuses every single bite with an unmistakable, cheesy zesty crunch that elevates it far beyond standard chicken bakes.