Preheat your oven to 375°F. While it warms up, combine parsley, Dijon mustard, lemon juice, olive oil, minced garlic, salt, and pepper in a small mixing bowl. Stir until you have a smooth, creamy mixture that’s bursting with aroma.
Place your salmon fillet on a parchment-lined baking sheet, skin-side down. Pat it dry with paper towels to ensure that the coating adheres. Then, slather the Dijon mixture generously over the top of the fish, spreading it evenly with the back of a spoon.
Slide the baking sheet into the preheated oven and bake for 18-20 minutes. The time will depend on the size and thickness of your salmon. You’ll know it’s done when the flesh easily flakes with a fork. Serve hot, dividing the fillets into individual portions.