Cheesy Texas Chicken Spaghetti Casserole Step-by-step instructions

Before you start

Before you begin cooking, organize your workspace and gather all your ingredients. Soften the cream cheese at room temperature so it incorporates smoothly into the sauce without leaving any lumps.

Shred the sharp cheddar and Monterey Jack cheeses from blocks, keeping them separate or mixing them according to the recipe divisions. Preheat your oven to 375°F (190°C) and lightly grease a 9x13-inch baking dish with cooking spray.

Instructions

Cooking the Chicken and Spaghetti

1. 1Poach and Shred the Chicken
   In a large pot, bring the chicken broth to a boil over medium-high heat. Add the raw boneless skinless chicken breasts to the pot. Reduce the heat to medium-low, cover, and simmer for 15 to 18 minutes. Ensure the chicken is fully cooked through to an internal temperature of 165°F (74°C). Transfer the chicken to a cutting board, let it cool slightly, then shred it into bite-sized pieces using two forks.
   Look for The chicken is ready when it is opaque throughout and shreds easily with a fork.
   Safe temperature 165°F (74°C) internal temperature (poultry)
   Tip Save the cooking broth in the pot to cook the spaghetti for extra flavor.
2. 2Boil the Spaghetti
   Bring the remaining chicken broth in the pot back to a boil, adding water if necessary to submerge the pasta. Add the spaghetti and cook according to the package instructions for 8 to 10 minutes, or until it is just al dente. Drain the spaghetti thoroughly in a colander, reserving about half a cup of the starchy cooking liquid, then set the pasta aside.
   Look for The pasta should be tender but still have a firm bite in the center.
   Tip Do not rinse the cooked pasta, as the natural starches help the cheese sauce cling to it.

At the end of this phase, the chicken breasts should be fully cooked, tender, and easily shredded with two forks, reaching a safe internal temperature of 165°F (74°C).

The spaghetti should be cooked just to al dente, meaning it still has a slight bite in the center, and drained well. The kitchen will smell of savory chicken broth and warm pasta, signaling that your base components are ready to be combined with the rich cheese sauce.

Mixing the Sauce and Tossing the Pasta

3. 3Prepare the Creamy Cheese Sauce
   In a large mixing bowl, combine the condensed cream of chicken soup and softened cream cheese. Stir in 1 cup of the shredded cheddar cheese and half a cup of the shredded Monterey Jack cheese. Mix vigorously with a spatula until the ingredients form a thick, uniform, and creamy cheese sauce.
   Look for The sauce should be smooth and well-blended, with the cheeses evenly distributed.
   Tip Ensure the cream cheese is fully softened to prevent small white lumps in your sauce.
4. 4Toss the Spaghetti and Chicken in Sauce
   Add the shredded chicken and cooked spaghetti to the bowl with the cheese sauce. Using tongs or a large silicone spatula, gently toss the ingredients together until every strand of pasta is thoroughly coated in the sauce. If the mixture seems too thick, stir in a splash of the reserved pasta cooking water to loosen it slightly.
   Look for The pasta and chicken should be completely enveloped in the creamy sauce.
   Tip Toss gently to avoid breaking the spaghetti strands into small pieces.

By the end of this phase, the shredded chicken and cooked spaghetti should be thoroughly tossed in a uniform, velvety cheese sauce. The cream cheese and melted shredded cheese should be completely integrated, coating every strand of pasta evenly. The mixture should look rich, creamy, and slightly thick, with the cheeses distributed evenly throughout the bowl, ready for the baking dish.

Baking and Garnishing the Casserole

5. 5Assemble the Casserole
   Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish with cooking spray. Transfer the tossed spaghetti and chicken mixture into the prepared dish, spreading it into an even layer. Sprinkle the remaining 1 cup of cheddar cheese and half a cup of Monterey Jack cheese evenly over the top of the pasta.
   Look for The top should be completely covered in an even layer of shredded cheese.
   Tip Spread the cheese all the way to the edges of the dish to create a sealed crust.
6. 6Bake and Garnish
   Place the casserole in the preheated oven and bake for 20 to 25 minutes. The cheese on top should be melted, golden brown, and bubbling vigorously around the edges of the dish. Remove the casserole from the oven and let it rest for 10 minutes. Garnish with chopped fresh parsley before slicing and serving hot.
   Look for The top should have a beautiful golden-brown crust and the edges should bubble.
   Tip Letting the casserole rest helps the sauce set, making it much easier to slice cleanly.

At the final checkpoint, the casserole should be bubbling vigorously around the edges, and the cheese topping should be melted, golden brown, and slightly crisp in spots. When you pull it from the oven, the aroma of toasted cheese and savory chicken should fill the room. After a brief rest, the chopped fresh parsley garnish adds a vibrant green pop against the golden crust, completing this comforting dish.

Common mistakes

One of the most common mistakes when making this casserole is overcooking the spaghetti during the initial boiling phase. Because the pasta will undergo a second cooking process in the oven, boiling it until it is completely soft will result in a mushy, structureless casserole.

Always drain the spaghetti while it still has a firm center. Another error is using pre-shredded cheese, which contains starch coatings that prevent smooth melting and can cause the sauce to separate during the baking process, ruining the velvety texture.

How to tell it’s done

To determine if the chicken spaghetti is perfectly baked, look for a bubbling perimeter and a deeply golden, melted cheese crust on top. The internal temperature of the casserole should reach a minimum of 165°F (74°C) to ensure that the chicken is safely reheated and the cheese is completely melted throughout the dish.

Avoid overbaking, which can dry out the sauce and make the pasta tough. Let the casserole rest for about 10 minutes after removing it from the oven to allow the sauce to set slightly before slicing.

• Poultry: 165°F (74°C) in the thickest part