Stir in the heavy cream, Parmesan cheese, Italian seasoning, and red pepper flakes (if using). Bring the sauce to a simmer, stirring occasionally, until it thickens slightly (about 3-4 minutes).
4. Add Sun-Dried Tomatoes and Spinach:
Stir in the chopped sun-dried tomatoes and fresh spinach. Cook for 2-3 minutes, or until the spinach wilts and everything is well combined.
5. Return the Chicken:
