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Add heavy cream, stir and return chicken to pan. Let everything heat up. Turn the heat off. Add remaining tablespoon of butter and let melt in the hot sauce. Garnish with chopped parsley and serve.
For a lighter sauce, you can use half and half or a mixture of milk and cornstarch so it will still thicken to a sauce consistency. For that, use 1 and 1/2 teaspoon of cornstarch and 1/2 cup of milk.