I've documented my obsession with sugar cookies over the years many times (here, here, and here). They're cute, customizable, and everyone loves them, so they're one of those desserts everyone should master. My first few times decorating cookies with royal icing though, were miserable failures. It comes down to two things: making the royal icing properly (the right consistency is key) and knowing how to apply it, so the end result looks appetizing and not like a sad science experiment. Here are my tips for icing sugar cookies so you can make them year-round.