Prepare the chicken: Pat the chicken dry. Mix salt, pepper, Italian seasoning, and smoked paprika. Season chicken on both sides, then lightly dredge in flour, shaking off excess.
Sear for flavor: Heat olive oil in a large skillet over medium-high.
Sear chicken 3–4 minutes per side until golden. Transfer to a plate; it will finish cooking in the sauce.
Sauté aromatics: Reduce heat to medium. Add a small splash of oil if needed.
Cook garlic 30 seconds until fragrant. Stir in sun-dried tomatoes for another 30 seconds.
Build the base: Pour in chicken broth. Scrape up browned bits.
Simmer 2 minutes to reduce slightly.
Make it creamy (lightened): Whisk milk and Greek yogurt together in a bowl until smooth. Lower heat to medium-low. Slowly stir the mixture into the skillet, then add Parmesan.
Stir until melted and the sauce looks silky.
Add greens and heat: Fold in spinach. Let it wilt, 1–2 minutes. If using frozen spinach, make sure it’s squeezed dry before adding.
Finish the chicken: Return chicken and any juices to the pan.
Simmer gently 3–5 minutes, spooning sauce over the top, until the chicken is cooked through and the sauce thickens slightly.
Brighten it up: Add lemon zest, a squeeze of lemon juice, and a pinch of red pepper flakes. Taste and adjust salt and pepper.
Serve: Top with chopped basil or parsley. Serve over whole-grain pasta, cauliflower mash, or a bed of arugula.
Spoon extra sauce over everything.