Preheat the Oven: Preheat your oven to 375°F (190°C).
Prepare the Chicken: Season the chicken breasts with salt and pepper on both sides.
Sear the Chicken: In a large oven-proof skillet, heat olive oil over medium-high heat. Add the chicken breasts and cook for about 4-5 minutes per side, until browned and cooked through. Remove the chicken from the skillet and set aside.
Cook the Mushrooms and Garlic: In the same skillet, add sliced mushrooms and minced garlic. Cook for about 3-4 minutes, until the mushrooms are tender and the garlic is fragrant.
Add Spinach: Add fresh spinach to the skillet and cook for another 2-3 minutes, stirring occasionally, until the spinach is wilted.
Combine Creamy Mixture: Reduce the heat to low. Stir in cream cheese, mozzarella cheese, Parmesan cheese, and Italian seasoning until everything is well combined and creamy.
Return Chicken to Skillet: Return the cooked chicken breasts to the skillet, nestling them into the spinach and mushroom mixture.
Bake: Transfer the skillet to the preheated oven and bake for 15-20 minutes, or until the chicken is heated through and the cheese is melted and bubbly.
Serve: Garnish with chopped fresh parsley before serving. Enjoy your delicious low carb chicken, spinach, and mushroom dish!