To a medium saucepan, pour in wine; simmer 3-5 minutes or until the wine has reduced by about half. Add in the butter and fresh thyme, whisk and cook until butter has melted into wine.
Slowly pour in the heavy cream, and bring the sauce to a boil.
Reduce the heat to low, and simmer until the sauce slightly thickens, about 5 minutes. Remove from the heat and stir in the Parmesan. Season the sauce with salt and pepper, to taste. Serve warm.