You can add or substitute your favorite vegetables to this easy-to-make baked-in-parchment dish. Carefully untwist parchment to check doneness; some vegetables may take longer to cook.
Preheat the oven to 400 degrees. Fold four 18-inch lengths of parchment paper in half, cut into a half-heart shape, and open. In a large bowl, combine the zucchini, eggplants, tomatoes, shallots, bell pepper, garlic, thyme, and parsley. Divide the vegetable mixture among the lengths of parchment, arranging on one half of each parchment heart near the crease. Drizzle the oil over the vegetables, and add salt and pepper. Fold the other half of the parchment over the ingredients. Make small overlapping folds to seal the edges, starting at the top of the heart. Two inches from the end, twist parchment twice, gently but firmly, to seal. Repeat.
Place the packets on a rimmed baking sheet or in a heavy skillet (preferably cast iron), and bake 25 minutes or until fully puffed. Remove from the oven, and open the packet carefully. Transfer the vegetables to a serving plate, and spoon the cooking liquid over if desired.