Season the chicken: Sprinkle both sides with salt, pepper, Italian seasoning, and smoked paprika.
Press gently so the seasoning sticks.
Sear the chicken: Heat olive oil and butter in a large skillet or Dutch oven over medium-high. Add chicken in a single layer and sear 4–5 minutes per side until golden. Transfer to a plate; it will finish cooking in the sauce.
Sauté aromatics: Lower heat to medium.
Add garlic and sun-dried tomatoes. Cook 30–60 seconds, stirring, until fragrant. Don’t let the garlic brown.
Deglaze: Pour in the chicken broth.
Scrape up the browned bits from the bottom of the pan—those are pure flavor.
Build the sauce: Stir in the cream and bring to a gentle simmer. Add Parmesan and whisk until melted and smooth. If you want a thicker sauce, stir in the cornstarch slurry and simmer 1–2 minutes.
Finish the chicken: Return chicken and any juices to the pan.
Reduce heat to low and simmer 5–8 minutes, or until the chicken reaches 165°F in the thickest part.
Add greens and brighten: Stir in spinach and cook until just wilted, about 1 minute. Add lemon juice and a pinch of red pepper flakes if using. Taste and adjust salt and pepper.
Serve: Garnish with fresh basil or parsley.
Spoon over pasta, rice, polenta, or mashed potatoes, and add extra sauce on top.