01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease with cooking spray.
02 - Arrange salmon fillets on the prepared baking sheet, placing skin-side down if applicable.
03 - In a small bowl, whisk together olive oil, melted butter, lemon juice, minced garlic, salt, pepper, and dill until thoroughly combined.
04 - Brush or spoon the marinade mixture evenly over each salmon fillet, ensuring complete coverage.
05 - Place lemon slices on top of each fillet if using, for presentation and additional citrus flavor.
06 - Bake for 12 to 15 minutes, or until salmon flakes easily with a fork and reaches internal temperature of 145°F.
07 - Remove from oven, sprinkle with freshly chopped parsley, and serve immediately while hot.