Prep the chicken: Pat the chicken dry and pound to an even 1/2–3/4 inch thickness. Season both sides with salt, pepper, Italian seasoning, and paprika.
If using flour, lightly coat each piece, shaking off excess.
Sear for flavor: Heat olive oil over medium-high in a large skillet. Add the chicken and sear 4–5 minutes per side until golden and almost cooked through. Transfer to a plate; tent with foil.
Build the base: Lower heat to medium.
Add butter and garlic to the same pan. Sauté 30–60 seconds until fragrant. Stir in sun-dried tomatoes and a pinch of red pepper flakes for heat.
Deglaze: Pour in chicken broth and scrape up any browned bits.
Simmer 2–3 minutes to reduce slightly.
Make it creamy: Stir in light cream (or half-and-half) and bring to a gentle simmer. Reduce heat to low.
Add yogurt and cheese: In a small bowl, whisk Greek yogurt with a ladle of warm sauce to temper it. Stir the mixture back into the pan.
Add Parmesan and whisk until smooth and slightly thickened.
Finish the chicken: Return chicken and any juices to the skillet. Spoon sauce over the top. Simmer 3–5 minutes until the chicken reaches 165°F internally and the sauce coats the back of a spoon.
Greens and brightness: Fold in spinach and cook until just wilted, 30–60 seconds.
Add lemon juice. Taste and adjust salt, pepper, or heat as needed.
Serve: Garnish with fresh basil or parsley. Serve over your favorite base with extra sauce spooned on top.