01 - Preheat oven to 400°F. Position the 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 to 3 minutes per side until a golden crust forms. The chicken does not need to be fully cooked through at this stage. Remove from the skillet and set aside on a plate.
04 - Reduce heat to medium. In the same skillet, melt the butter. Add minced garlic and cook for about 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 the heavy cream, lemon juice, and lemon zest. Stir to combine and bring the mixture to a brief simmer.
07 - Sprinkle in the grated Parmesan cheese and stir 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 to 15 minutes until the chicken reaches an internal temperature of 165°F.
10 - Remove from the oven and serve hot. Garnish with additional lemon zest or shaved Parmesan if desired.