01 - In a large skillet over medium heat, melt the butter.
02 - Add the chopped shallot and sauté for 2 minutes until softened.
03 - Stir in the garlic and cook for 30 seconds, then add the sliced mushrooms.
04 - Increase heat to medium-high and cook, stirring occasionally, until mushrooms are golden and liquid evaporates, about 6 to 8 minutes.
05 - Pour in the stock and simmer for 2 minutes, scraping up browned bits from the pan.
06 - Reduce heat to medium-low and stir in heavy cream, thyme, salt, and pepper.
07 - Simmer gently for 3 to 5 minutes, stirring occasionally, until sauce thickens to desired consistency.
08 - Stir in chopped parsley, adjust seasoning if needed, and serve hot. Garnish with extra parsley as desired.