01 - Preheat oven to 400°F. Position rack in the center of the oven.
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 deep golden crust forms. Remove the chicken and set aside on a plate.
04 - Reduce heat to medium. Add butter to the same skillet. Sauté minced garlic for about 1 minute until fragrant and lightly golden.
05 - Add fresh baby spinach to the skillet. Cook, stirring frequently, for approximately 2 minutes until completely wilted.
06 - Pour in heavy cream and add grated Parmesan cheese, lemon zest, and fresh lemon juice. Stir to combine and simmer for 1 to 2 minutes until the sauce slightly thickens and coats the back of a spoon.
07 - Nestle the seared chicken breasts back into the skillet, spooning the spinach cream sauce over the top of each piece.
08 - Transfer the skillet to the preheated oven. Bake for 12 to 15 minutes until the chicken reaches an internal temperature of 165°F and is fully cooked through.
09 - Remove from oven and serve hot, garnished with additional Parmesan cheese and fresh lemon slices if desired.