Heat 1 tablespoon of olive oil in a large skillet over medium heat.
Add the chicken breasts, season them with salt, black pepper, and Italian seasoning, and cook for 5–7 minutes per side until golden brown. Remove from the pan and set aside.
In the same skillet, add minced garlic and chopped onions. Sauté for 2 minutes until fragrant.
Stir in the chopped sun-dried tomatoes and cook for another minute.
Pour in the heavy cream and bring it to a gentle simmer. Stir in the grated Parmesan cheese until it melts into a smooth, creamy sauce.
Add the fresh spinach and let it wilt into the sauce. Stir well to combine.
Return the cooked chicken breasts to the skillet, spooning the creamy sauce over them. Let everything simmer for 5 minutes until the chicken is heated through.
Serve hot with pasta, rice, or crusty bread, and enjoy your delicious Creamy Tuscan Chicken!