Begin by preheating your oven to 375°F (190°C). This ensures that the salmon cooks evenly and thoroughly.
Cut two large sheets of aluminum foil, each about 2 feet long. You’ll want enough foil to create a tightly sealed packet around the salmon.
In a mixing bowl, whisk together the melted butter, brown sugar, lemon juice, Dijon mustard, garlic powder, onion powder, salt, and dried thyme. This mixture will be the star of your Baked Salmon In Foil, bringing a lovely sweetness and depth of flavor.
Place one salmon filet in the center of each foil sheet. Pour half of the glaze over each piece of salmon, making sure to coat it well. Lay lemon slices on top of the fish for added flavor and a pop of freshness.
Fold the sides of the foil over the salmon, then fold the ends to create a sealed packet. Make sure there are no holes for steam to escape – this is key for a moist result.
Place the foil packets on a baking sheet and transfer them to the oven. Bake for 15-20 minutes, or until the salmon is cooked through and flakes easily with a fork. The cooking time may vary depending on the thickness of your fillets.
Once done, carefully open the foil packets (watch out for steam!) and garnish with chopped fresh parsley. Serve the Baked Salmon In Foil directly in the packets for a rustic presentation or transfer it to plates for a more polished look.