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A cheesy Fiesta Chicken Pasta Casserole in a white baking dish, topped with fresh cilantro and black olives.

Fiesta Chicken Pasta Casserole

This Fiesta Chicken Pasta Casserole is a vibrant, cheesy, and zesty Tex-Mex masterpiece perfect for any weeknight. Tender chicken and rotini pasta are enveloped in a ridiculously creamy and tangy sauce, kicked up with zesty tomatoes, green chiles, and smoky spices. It's a celebratory dish that turns any meal into a delicious fiesta.
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Prep Time 15 minutes
Cook Time 50 minutes
Total Time 1 hour 5 minutes
Servings: 8
Course: Main Course
Cuisine: Tex-Mex
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

  • 1 pound rotini pasta
  • 1.5 pounds boneless, skinless chicken breasts, cut into bite-sized cubes
  • 1 tablespoon olive oil
  • 1 medium yellow onion, diced
  • 1 bell pepper any color
  • 3 cloves garlic, minced
  • 1 packet taco seasoning about 2-3 tablespoons
  • 8 ounces cream cheese, softened and cubed
  • 1 cup full-fat sour cream
  • 1/2 cup chicken broth
  • 2 cups shredded Mexican blend cheese
  • 1/2 cup fresh cilantro, chopped, plus more for garnish
  • Salt and black pepper, to taste

Equipment

  • 9x13 inch baking dish
  • Large pot
  • Colander
  • Large skillet or Dutch oven
  • Cutting board
  • Chef's knife
  • Large mixing bowl
  • Slotted spoon
  • Wooden spoon or spatula
  • Measuring cups and spoons
  • Cheese grater

Method
 

  1. Preheat oven to 375°F (190°C) and grease a 9x13-inch baking dish. Cook rotini in a large pot of salted boiling water until al dente (about 1-2 minutes less than package directions). Drain well and set aside.
  2. While pasta cooks, heat olive oil in a large skillet or Dutch oven over medium-high heat. Add cubed chicken, season with salt and pepper, and cook until lightly browned. Remove chicken with a slotted spoon and set aside.
  3. In the same skillet, add the diced onion and bell pepper. Sauté for 4-5 minutes until softened. Add the minced garlic and cook for 1 more minute until fragrant.
  4. Return the chicken to the skillet. Sprinkle with taco seasoning and stir to coat. Pour in the undrained Rotel and chicken broth, scraping up any browned bits. Bring to a simmer.
  5. Stir in the cubed cream cheese until it melts completely into a smooth sauce. Remove from heat and stir in the sour cream and 1/2 cup of chopped cilantro until fully combined.
  6. In a large bowl, combine the cooked pasta with the creamy chicken sauce, stirring gently to coat everything evenly.
  7. Pour half of the pasta mixture into the prepared baking dish and top with 1 cup of shredded cheese. Add the remaining pasta mixture and top with the final cup of cheese.
  8. Bake uncovered for 20-25 minutes, until the cheese is melted, golden, and the sauce is bubbling at the edges. Let the casserole rest for 5-10 minutes before garnishing with more fresh cilantro and serving.

Notes

Pro Tips: For the creamiest sauce, ensure your cream cheese is fully softened before adding it to the skillet. Cook the pasta al dente, as it will continue to cook in the oven and absorb sauce. Don't skip sautéing the chicken and vegetables; this step builds a deep flavor foundation that makes a huge difference.
Variations & Add-ins: Substitute chicken with ground beef, turkey, or chorizo. For a vegetarian option, use a can of black beans and a can of corn. Add a smoky kick with fire-roasted tomatoes and a teaspoon of smoked paprika. For extra crunch, top with crushed tortilla chips during the last 5 minutes of baking.
Serving Suggestions: Serve with toppings like sliced avocado, extra sour cream, pickled jalapeños, and a squeeze of fresh lime juice. A simple side salad with a lime vinaigrette pairs perfectly.