Preheat your oven to 375°F (190°C) [1.1]. Line a rimmed baking sheet with a large piece of aluminum foil.
Place the salmon fillets in the center of the foil.
In a small bowl, whisk together the melted butter, minced garlic, lemon juice, salt, and black pepper.
Pour the garlic butter mixture evenly over the salmon. Top the salmon with fresh lemon slices.
Fold the sides of the foil over the salmon, crimping the edges to seal completely and create a foil packet.
Bake in the preheated oven for 15-20 minutes, depending on the thickness of the salmon.
Optional: Carefully open the foil packet and broil for 2-3 minutes to get golden edges.
Garnish with chopped fresh parsley before serving.