01 - Preheat oven to 400°F.
02 - Pat chicken breasts dry and season both sides with salt, pepper, and Italian herbs.
03 - Heat olive oil in a large oven-safe skillet over medium-high heat. Sear chicken for 3–4 minutes per side until golden. Remove and set aside.
04 - Lower heat to medium. Add butter to the skillet and sauté garlic for 1 minute until fragrant.
05 - Add spinach to the skillet and cook, stirring, until wilted, about 2 minutes.
06 - Stir in heavy cream, Parmesan, lemon zest, and lemon juice. Simmer until slightly thickened, 1–2 minutes.
07 - Return chicken to the skillet, spooning sauce over the top. Transfer to oven and bake for 12–15 minutes, or until internal temperature reaches 165°F.
08 - Serve hot, garnished with extra Parmesan and lemon slices if desired.