Cook the pasta according to package instructions. Drain and set aside.
Season the chicken 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 and fully cooked (165°F internal temperature). Remove and let rest, then slice.
In the same pan, sauté garlic and dried tomatoes for 1–2 minutes until fragrant.
In a bowl, whisk together flour, milk, and Parmesan cheese.
Pour the mixture into the pan and add spinach. Cook until the sauce thickens and spinach wilts.
Add cooked pasta and sliced chicken into the sauce.
Toss everything together until well coated.
Garnish with parsley and black pepper, then serve your Chicken Spinach Pasta.