01 - Preheat oven to 400°F (200°C). Position rack in the center.
02 - Pat chicken breasts dry with paper towels. Season both sides evenly with salt, pepper, and dried Italian herbs.
03 - Heat olive oil in a large oven-proof skillet over medium-high heat. Sear chicken breasts for 2–3 minutes per side until a golden crust forms. Remove and set aside; they do not need to be fully cooked through at this stage.
04 - Reduce heat to medium. Melt butter in the same skillet, then add minced garlic. Cook for about 30 seconds until fragrant, stirring to prevent browning.
05 - Add fresh spinach to the skillet and sauté, tossing gently, until just wilted—about 2 minutes.
06 - Pour in heavy cream, fresh lemon juice, and lemon zest. Stir to combine and bring the mixture to a brief simmer.
07 - Sprinkle in grated Parmesan cheese and stir continuously until melted and the sauce thickens slightly.
08 - Return seared chicken breasts to the skillet, nestling them into the spinach cream sauce. Spoon sauce over the top. Transfer the skillet to the preheated oven and bake for 12–15 minutes, until chicken reaches an internal temperature of 165°F (74°C).
09 - Serve hot, garnished with additional lemon zest or shaved Parmesan if desired. Pair with roasted potatoes or a crisp green salad for a complete meal.