01 - Preheat oven to 400°F. Pat chicken breasts dry and season both sides liberally 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 to 4 minutes per side until golden brown. Remove chicken from skillet and set aside.
03 - Reduce heat to medium. Add butter to the skillet and sauté minced garlic for 1 minute until fragrant.
04 - Add fresh spinach to the skillet and cook, stirring constantly, until wilted, approximately 2 minutes.
05 - Pour in heavy cream and add Parmesan cheese, lemon zest, and lemon juice. Simmer the mixture until slightly thickened, about 1 to 2 minutes.
06 - Return the chicken to the skillet, spooning sauce over the top. Transfer skillet to the oven and bake for 12 to 15 minutes, or until internal temperature reaches 165°F.
07 - Serve hot, garnished with extra Parmesan cheese and lemon slices if desired.