Step 1: Cook the Fettuccine

1. Boil the Pasta: Bring a large pot of salted water to a boil. Once boiling, add the fettuccine pasta and cook according to the package directions, usually around 8-10 minutes, until al dente.
2. Reserve Pasta Water: Before draining, reserve about 1/2 cup of the pasta cooking water. This will be used later to help the sauce adhere to the noodles and create a silky texture.
3. Drain Pasta: Drain the pasta and set it aside, keeping the reserved pasta water.

Step 2: Prepare the Chicken

1. Season the Chicken: While the pasta cooks, season the chicken breasts with salt, pepper, and Italian seasoning on both sides.
2. Cook the Chicken: Heat a large skillet or sauté pan over medium heat and add a tablespoon of olive oil. Once the oil is hot, add the chicken breasts and cook for 5-7 minutes per side, or until golden brown and fully cooked through. The internal temperature should reach 165°F (74°C).
3. Rest and Slice: Remove the chicken from the pan and let it rest for a few minutes before slicing it into thin strips or bite-sized pieces.

Step 3: Make the Creamy Sun-Dried Tomato Sauce

1. Sauté Garlic and Tomatoes: In the same pan, add a bit more olive oil if necessary. Over medium heat, sauté the garlic for 1-2 minutes until fragrant. Add the chopped sun-dried tomatoes and cook for another 2-3 minutes, allowing their flavors to meld with the garlic.
2. Deglaze the Pan: Pour in the chicken broth and use a wooden spoon to scrape up any browned bits from the bottom of the pan. These caramelized bits are full of flavor and will enhance the sauce.
3. Add the Cream: Lower the heat to medium-low, then add the heavy cream to the pan, stirring to combine. Allow the cream to simmer for 3-4 minutes, thickening slightly.
4. Add Cheese and Seasonings: Stir in the grated Parmesan cheese, Italian seasoning, and red pepper flakes (if using). Continue to stir until the cheese melts into the sauce, creating a smooth, creamy texture.
5. Taste and Adjust: Taste the sauce and adjust the seasoning with more salt, pepper, or red pepper flakes as needed. For an extra burst of flavor, you can add a tablespoon of lemon juice to brighten the sauce.

Step 4: Combine the Pasta and Chicken

1. Add the Pasta: Add the cooked fettuccine to the pan with the creamy sun-dried tomato sauce. Toss to coat the pasta in the sauce, adding a bit of the reserved pasta water if needed to help the sauce adhere and create a silky texture.
2. Add the Chicken: Gently fold in the sliced chicken, ensuring it is evenly distributed throughout the pasta.
3. Finish with Butter (Optional): For an extra touch of richness, stir in a tablespoon of butter at this point.

Step 5: Garnish and Serve

1. Garnish: Transfer the creamy sun-dried tomato and chicken fettuccine to plates and garnish with freshly chopped basil or parsley. This adds a pop of color and freshness to the dish.
2. Serve: Serve the pasta immediately while hot. You can offer extra grated Parmesan on the side for guests to add as desired.