Prep the chicken: Pat dry and season with salt, pepper, and paprika on both sides.
Sear: Heat olive oil in a large skillet over medium-high. Add chicken in a single layer.
Cook 3–4 minutes per side until golden and mostly cooked through. Transfer to a plate.
Sauté aromatics: Lower heat to medium. Add a drizzle more oil if needed.
Stir in garlic and sun-dried tomatoes. Cook 30–60 seconds until fragrant.
Build the sauce: Pour in chicken broth. Stir in Italian seasoning and red pepper flakes.
Scrape up browned bits. Simmer 2–3 minutes to reduce slightly.
Make it creamy (dairy light): Turn heat to low. In a small bowl, whisk Greek yogurt with a few spoonfuls of hot broth from the pan to temper. Stir the tempered yogurt into the skillet until smooth.
Do not boil.
Add greens: Stir in spinach until wilted. If using Parmesan, add now and stir until melted.
Finish the chicken: Return chicken and accumulated juices to the skillet. Simmer gently 2–4 minutes until cooked through (165°F internal).
Squeeze in lemon juice and adjust salt and pepper.
Serve: Top with fresh basil if you like. Spoon over pasta, rice, or roasted veggies.