Step 1: Preheat your oven to 375°F (190°C).
Step 2: Cut a large piece of aluminum foil, about 18 inches long.
Step 3: In a mixing bowl, combine the softened butter, lemon juice, olive oil, minced garlic, grated Parmesan cheese, Italian seasoning, salt, and pepper. Mix until creamy.
Step 4: Place the salmon fillet skin-side down on the foil and spread the garlic herb butter mixture over the top.
Step 5: Fold the foil over the salmon, creating a sealed packet.
Step 6: Place the foil packet on a baking sheet and bake for 20-25 minutes.
Step 7: Carefully open the foil packet and garnish with chopped parsley before serving.