01 - Preheat oven to 400°F. Position the rack in the center.
02 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, freshly ground black pepper, and dried Italian herbs.
03 - Heat olive oil in a large oven-safe skillet over medium-high heat. Sear the chicken for 3 to 4 minutes per side until a golden crust forms. Remove from the skillet and set aside.
04 - Reduce heat to medium. Add butter to the same skillet. Sauté the minced garlic for 1 minute until fragrant, stirring to prevent browning.
05 - Add fresh baby spinach to the skillet. Cook, stirring constantly, until fully wilted, about 2 minutes.
06 - Pour in the heavy cream and add the freshly grated Parmesan cheese, lemon zest, and lemon juice. Stir well and simmer for 1 to 2 minutes until the sauce slightly thickens.
07 - Place the seared chicken breasts back into the skillet, nestling them into the spinach. Spoon the sauce over the top of each breast.
08 - Transfer the skillet to the preheated oven. Bake for 12 to 15 minutes, or until the chicken reaches an internal temperature of 165°F.
09 - Remove from the oven and serve hot. Garnish with additional Parmesan and fresh lemon slices if desired.