Preheat oven to 400 degrees F. Lightly oil a 9×13 baking dish or coat with nonstick spray.
Season chicken with Italian seasoning, salt and pepper, to taste.
Melt 2 tablespoons butter in a large skillet over medium high heat. Add chicken, skin-side down, and sear both sides until golden brown, about 2-3 minutes per side; set aside.
Melt remaining 1 tablespoon butter in the skillet. Stir in spinach and cook, stirring occasionally, until it begins to wilt, about 2 minutes; set aside.
To make the garlic parmesan cream sauce, melt butter in the skillet over medium heat. Add garlic, and cook, stirring frequently, until fragrant, about 1-2 minutes. Whisk in flour until lightly browned, about 1 minute.
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