Melt 3 tablespoons of butter in a pan. Add garlic to the pan and cook for 1 minute.
Pour the heavy cream into the pan and bring it to a simmer over medium heat. Make sure to stir often so the cream doesn’t burn.
Stir in the Parmesan and nutmeg and continue to cook until it thickens, approximately 8-10 minutes. You will know it is ready when the sauce is thick enough to coat the back of your spoon.
Add salt and pepper to taste.
Remove the sauce from the heat and add to your meal or let cool completely if you are saving for later.