**Melt the butter**: In a medium saucepan over medium heat, melt the butter.
**Sauté the garlic**: Add the minced garlic and cook for about 1 minute, stirring frequently to avoid burning.
**Add cream and milk**: Slowly pour in the heavy cream and milk, whisking gently to combine. Bring the mixture to a gentle simmer, but do not let it boil.
**Stir in the cheese**: Reduce the heat to low. Gradually add the Parmesan cheese, whisking continuously until it melts and the sauce thickens.
**Season**: Add the salt, pepper, and any optional seasonings like Italian herbs or a tiny pinch of nutmeg. Taste and adjust seasonings as needed.
**Adjust consistency**: If the sauce becomes too thick, whisk in a splash of milk until desired consistency is reached.
**Serve**: Pour over cooked fettuccine or your favorite pasta. Garnish with extra Parmesan cheese or fresh parsley if desired.