Season each side of each pounded chicken breast with Italian Seasoning and salt and pepper.
4 boneless, skinless chicken breasts, Kosher salt and freshly ground black pepper, 1 teaspoon Italian Seasoning
Combine flour and grated parmesan in a shallow bowl. Dredge each chicken breast in the flour mixture, coating both sides.
4 tablespoons all-purpose flour, 3 tablespoons freshly grated Parmesan cheese
Heat a large skillet over medium-high heat. Add the 2 tablespoons butter and stir/melt.
2 tablespoons European-style butter
Cook the chicken (in batches if necessary) for 4-5 minutes per side or until its fully cooked (165°F in the center and no longer pink) and browned on both sides. Remove from the skillet and place on a plate. Cover with foil.
Return the skillet to medium-high heat, and add the remaining ¼ cup butter. Use a wooden spoon to scrape the bottom of the pan as the butter melts. The brown bits hold a lot of flavor, so no need to remove them.
¼ cup European-style butter
Add the garlic and sun-dried tomatoes and cook for 1-2 minutes or until fragrant.
4 cloves garlic, 8.5 ounces sun-dried tomatoes
Whisk in the flour and allow to thicken for approximately 1 minute.
1 tablespoon all-purpose flour
Whisk in the heavy cream, chicken broth, parmesan cheese, Italian seasoning, and pepper. Stir to combine.
½ cup heavy cream, 1 cup low-sodium chicken broth, ½ cup freshly grated Parmesan cheese, 1 teaspoon Italian seasoning, ¼ teaspoon ground black pepper
Add the spinach and reduce heat to simmer. Allow to cook until the sauce slightly thickens and the spinach wilts.
1 cup baby spinach
Add the chicken back into the skillet and turn to coat in the sauce. Allow to continue to simmer until the chicken is heated through, 2-3 minutes. Garnish with fresh parsley.
Chopped fresh parsley