Begin by seasoning both sides of the chicken breasts with salt, pepper, onion powder, dried thyme, and dried rosemary to enhance the flavor.
In a large skillet, heat the olive oil over medium-high heat until shimmering. Carefully add the seasoned chicken breasts to the skillet. Sear them for 5-6 minutes on each side, or until they are golden brown and cooked thoroughly (internal temperature should reach 165°F / 75°C). Once cooked, remove the chicken from the skillet and transfer to a plate.
In the same skillet, reduce the heat slightly and add the minced garlic. Sauté for about 1 minute, stirring frequently, until the garlic is fragrant—be mindful not to let it burn.
Pour in the chicken broth, using a wooden spoon to scrape the bottom of the skillet and deglaze it, releasing any flavorful bits stuck to the pan. Lower the heat further and stir in the heavy cream, allowing it to come to a gentle simmer.
Gradually add the freshly grated Parmesan cheese to the cream mixture, stirring continuously until it melts completely and the sauce begins to thicken slightly, creating a creamy consistency.
Stir in the chopped spinach, letting it cook for an additional 2-3 minutes, or until it wilts and brightens in color.
Return the seared chicken breasts to the skillet, spooning the luscious creamy sauce over them. Allow to simmer for another minute to heat the chicken through and absorb the flavors.
Taste the sauce and adjust the seasoning if needed, adding more salt or pepper according to your preference.
Before plating, garnish with finely chopped fresh parsley to add a touch of color.
Notes
Serve with roasted vegetables or garlic bread for a complete meal.