Bring a large pot of salted water to a boil. Add 8 ounces of penne or rotini pasta and cook according to package instructions until al dente. Drain and set aside.
In a large mixing bowl, combine 2 cups of shredded cooked chicken, 1 cup salsa, and 1 cup sour cream. Stir in 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon cumin, 1/2 teaspoon salt, and 1/2 teaspoon black pepper. Mix until everything is well incorporated.
Fold in the cooked pasta along with 1 cup shredded cheddar cheese and 1 cup shredded mozzarella cheese. The cheese will start melting into the warm pasta, so make sure everything is evenly coated.
Transfer the mixture into a greased 9x13 inch baking dish, spreading it out evenly. Sprinkle 1 cup of crushed tortilla chips over the top to create that signature crispy topping.
Preheat your oven to 350°F (177°C). Bake uncovered for 20-25 minutes or until the cheese is bubbly and the tortilla topping turns golden brown.
Let the Cheesy Tortilla Chicken Pasta Bake cool for a few minutes before serving. The flavors meld beautifully as it rests, making each bite a delightful experience.