There are many advantages to cooking en papillote. First, cooking in a sealed packet helps keep the flavors in the dish as none of the steam can escape. Next, cleanup is simple since all the juices remain in the packet and little to none escapes to dirty the baking sheet. A third perk is that the presentation is unique and fun. There's nothing better than plating up all the parchment packages and having your guests slice them open to reveal a perfectly cooked entree.