Choose lean, tender protein Fish fillets are the classic choice for the en papillote method. They cook quickly and come out beautifully moist and flavorful. Tilapia, salmon, halibut, and trout, for example, all work well.

You want to steam your fish, not drown it. If using an acidic liquid (such as lemon juice or vinegar) in your recipe, always opt to use parchment paper because the acid may react with aluminum foil.

Fish fillets: The best type of fish for baking are flaky white fish, such as tilapia, halibut, cod, bass, grouper, haddock, catfish or snapper. White fish doesn't always mean that the fish is literally white in color; it is a category of mild-flavored, quick-cooking fish.