Prep the chicken. Pat the chicken dry. Season both sides with salt, pepper, garlic powder, and smoked paprika.
If your breasts are thick, slice them into cutlets for quicker, more even cooking.
Sear for color and flavor. Heat the olive oil and butter in a large skillet over medium-high heat. Add the chicken in a single layer and cook until golden on both sides, about 4–5 minutes per side for cutlets (longer for thicker pieces). Transfer to a plate; it’s okay if they’re not fully cooked yet.
Sauté aromatics. Lower the heat to medium.
Add the garlic and sun-dried tomatoes to the skillet. Cook 1–2 minutes, stirring to keep the garlic from browning. Scrape up any browned bits—that’s pure flavor.
Build the sauce. Pour in the chicken broth and simmer for 2–3 minutes to reduce slightly. Stir in the heavy cream, Parmesan, Italian seasoning, and red pepper flakes if using.
Simmer gently until the sauce thickens enough to coat the back of a spoon, about 3–5 minutes.
Add the greens. Stir in the spinach and let it wilt into the sauce. Taste and adjust the salt. A small squeeze of lemon brightens everything—start with 1 teaspoon and add more if needed.
Finish the chicken. Return the chicken and any juices to the pan.
Spoon sauce over the pieces and simmer on low for 3–5 minutes, or until the chicken reaches 165°F in the thickest part. The sauce should be glossy and creamy.
Garnish and serve. Top with fresh basil or parsley. Serve over pasta, rice, mashed potatoes, polenta, or with warm crusty bread to catch the sauce.