Because this is a two-step recipe, you can definitely get a head start if you want to make it in advance. You can clean, trim, and steam the Brussels sprouts. When they are finished steaming, pour into a colander and run cold water over them so that they don’t continue to cook. Pat dry with a kitchen towel and put in the refrigerator until you’re ready to finish the recipe. You can also prep the grated Parmesan and spice mixture in advance. You may need to add a minute or two to the cooking time if your sprouts are just out of the fridge.