01 - Preheat oven to 400°F (200°C). Position rack in the center of the oven.
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 from the skillet and set aside; the chicken does not need to be fully cooked at this stage.
04 - Reduce heat to medium. Melt butter in the same skillet, then add minced garlic. Cook for approximately 30 seconds until fragrant, stirring constantly to prevent burning.
05 - Add fresh baby 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 grated Parmesan cheese into the sauce, stirring continuously until fully melted and the sauce thickens slightly.
08 - Nestle the seared chicken breasts back into the spinach cream sauce, spooning some of the sauce over the top of each piece.
09 - Transfer the skillet to the preheated oven. Bake for 12-15 minutes until the chicken reaches an internal temperature of 165°F (74°C).
10 - Remove from the oven and serve hot, garnished with additional lemon zest or shaved Parmesan if desired.