Step 1: Prepare the Chicken

1. Season the Chicken: In a small bowl, mix together the chili powder, cumin, garlic powder, onion powder, salt, and pepper. Rub this spice mixture all over the chicken breasts.
2. Cook the Chicken: In a large skillet, heat the olive oil over medium heat. Add the seasoned chicken breasts and cook for about 6–7 minutes on each side, or until fully cooked and no longer pink in the center. Remove the chicken from the skillet and set aside.

Step 2: Make the Cheese Sauce

1. Melt Butter: In the same skillet, melt the butter over medium heat.
2. Add Flour: Whisk in the flour and cook for about 1 minute, stirring constantly to create a roux.
3. Add Milk: Gradually whisk in the milk, continuing to stir until the mixture thickens (about 3–5 minutes).
4. Add Cheese and Seasonings: Remove the skillet from heat and stir in the shredded cheddar cheese, diced tomatoes, green chilies (if using), paprika, salt, and pepper until the cheese is melted and the sauce is smooth.

Step 3: Combine and Serve

1. Slice the Chicken: Slice the cooked chicken breasts and return them to the skillet with the cheese sauce. Stir to coat the chicken in the sauce.
2. Serve: Serve the Mexican chicken with cheese sauce over rice, in tortillas, or with your favorite sides. Enjoy!