01 - Preheat oven to 400°F. Pat chicken breasts dry and season both sides generously with salt, pepper, and Italian herbs.
02 - Heat olive oil in a large oven-safe skillet over medium-high heat. Sear the chicken for 3–4 minutes per side until golden brown. Remove chicken from the skillet and set aside.
03 - Reduce heat to medium. Add butter to the skillet and sauté the minced garlic for 1 minute until fragrant, being careful not to burn it.
04 - Add the fresh baby spinach to the skillet. Cook, stirring frequently, until the spinach is completely wilted, about 2 minutes.
05 - Stir in the heavy cream, grated Parmesan, lemon zest, and lemon juice. Simmer the mixture over medium heat until slightly thickened, about 1–2 minutes.
06 - Return the seared chicken to the skillet, spooning some of the sauce over the top of each piece. Transfer the skillet to the oven and bake for 12–15 minutes, or until the chicken reaches an internal temperature of 165°F.
07 - Serve the dish hot, garnished with extra Parmesan cheese and lemon slices if desired.