Cook the pasta according to the package directions until al dente. Drain and set aside.
Season the chicken breasts with salt, pepper, and Italian seasoning on both sides.
Heat olive oil in a large skillet over medium heat.
Cook the chicken for 6–8 minutes per side until golden brown and the internal temperature reaches 165°F (74°C).
Transfer the chicken to a cutting board and let it rest for several minutes before slicing into thin strips.
In the same skillet, sauté the minced garlic and chopped sun-dried tomatoes for 1–2 minutes until fragrant.
In a small bowl, whisk together the flour, milk, and grated Parmesan until smooth.
Pour the mixture into the skillet and stir continuously until the sauce begins to thicken.
Add the fresh spinach and cook until wilted.
Stir the cooked pasta into the creamy sauce until evenly coated.
Add the sliced chicken and gently toss everything together.
Garnish the Chicken Spinach Pasta with chopped parsley and freshly ground black pepper before serving.