01 - Pat the chicken breasts thoroughly dry. Season both sides generously with salt, black pepper, and Italian seasoning.
02 - In a large, deep skillet or Dutch oven, heat the olive oil over medium-high heat. Carefully place the seasoned chicken breasts in the hot skillet. Sear for 5-6 minutes per side until golden brown and cooked through. Transfer the chicken to a plate and loosely cover to keep warm.
03 - Add the unsalted butter to the same skillet. Once melted, add the minced garlic and sauté for approximately 1 minute until fragrant, being careful not to burn.
04 - Pour in the chicken broth, using a spatula to scrape up any flavorful browned bits from the bottom of the skillet. Stir in the heavy cream and grated Parmesan cheese. Bring the mixture to a gentle simmer.
05 - Add the sliced sun-dried tomatoes and fresh baby spinach to the simmering sauce. Stir gently and cook for 2-3 minutes, or until the spinach has wilted.
06 - Return the seared chicken breasts to the skillet, nestling them into the sauce. Allow to simmer gently for an additional 4-5 minutes, spooning the sauce over the chicken to ensure it is heated through.
07 - Taste the sauce and adjust seasoning with additional salt and pepper if necessary. Serve the creamy Tuscan chicken hot, with an optional garnish of extra Parmesan cheese.