Pour in chicken stock and reduce. Add heavy cream, oregano, Dijon mustard, lemon juice, basil, and Parmesan cheese. Adjust seasoning.
Optional: Blend a portion of the sauce for texture. Return blended sauce to the pan.
Add chicken back to the pan, spoon sauce over it, and cook for a few more minutes.
Taste for seasoning and serve with pasta or mashed potatoes. Enjoy!
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