In a medium saucepan over medium heat, melt the butter.
Add minced garlic and sauté until fragrant, about 1 minute.
Pour in the heavy cream, stirring constantly.
Slowly whisk in the Parmesan cheese until melted and smooth.
Season with salt, pepper, and nutmeg if using.
Simmer for 2-3 minutes, stirring occasionally until the sauce thickens.
Remove from heat and serve immediately over cooked pasta.
Garnish with fresh parsley before serving.