Yes, you can make the waffles ahead, however, you can't make the batter ahead. Since the batter has fluffy egg whites folded in it will fall or deflate a bit if made ahead. To make the waffles ahead prepare the recipe as directed and then let the waffles cool completely on a cooling rack. Store them in an ai-tight container in the fridge. When you're ready to serve them toast them in a toaster oven or conventional oven at 350ºF for about 10 to 15 minutes.