01 - Preheat oven to 400°F. 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 to 3 minutes per side until a golden crust forms. Remove and set aside; they will finish cooking in the oven.
04 - Reduce heat to medium. Melt butter in the same skillet, add minced garlic, and cook for 30 seconds until fragrant.
05 - Add fresh spinach to the skillet and sauté, tossing gently, until just wilted, about 2 minutes.
06 - Pour in heavy cream, lemon juice, and lemon zest. Stir to combine and bring briefly to a simmer.
07 - Sprinkle Parmesan cheese into the sauce and stir continuously until melted and slightly thickened.
08 - Return chicken breasts to the skillet, nestling them into the spinach cream sauce. Spoon sauce over the top. Transfer to the oven and bake 12 to 15 minutes until chicken reaches an internal temperature of 165°F.
09 - Serve hot directly from the skillet, garnished with additional lemon zest or shaved Parmesan if desired.