In a sauté pan over medium heat, melt the butter. Add in the garlic and cook until it is just starting to brown.
Add the cut asparagus and cook until bright green and al dente tender. Pour in the half and half and bring to a simmer. Stir in the cheese and nutmeg and season with salt and pepper. and
Transfer to an au gratin or baking dish and sprinkle with extra parmesan. Bake for 15 minutes or until the cheese is melted and lightly browned. Let rest for 5 minutes for the sauce to thicken before serving.
Notes
You don't have to bake this. It is completely optional. If you want to serve it as a creamy side dish make sure the asparagus is cooked as much as you like before adding the half and half.