In a large skillet over medium heat, melt 1 tablespoon of butter. Stir in the sage and garlic. Saute for about a minute. Stir in wine and simmer until half is reduced.
Stir in heavy cream and heat until just simmering. Whisk in the remaining 3 tablespoons of butter into the cream sauce one tablespoon at a time until it is melted.
Add the Parmesan cheese and nutmeg. Stir over low heat for 1-2 minutes until sauce thickens. Add salt and pepper to taste. Serve as soon as possible. Enjoy!