Preheat oven to 400 degrees F. Line a 13" x 9" baking dish with foil.
Rinse the salmon under cold water to remove any icy glaze and pat dry with paper towels. Brush both sides of salmon with olive oil and place in the foil-lined baking dish with the skin-side down.
Roast salmon in oven for 10 minutes.
Meanwhile, in a small mixing bowl whisk together maple syrup, soy sauce, melted butter, garlic, salt, and pepper. Remove the pan from the oven after the initial roasting time and pour the maple sauce evenly over each of the pieces. Return the baking sheet to the oven and roast for an additional 10 to 12 minutes or just until the salmon flakes easily and is cooked throughout.
Serve with some of the sauce drizzled over the top and a garnish of fresh chopped parsley, if desired.