In a small bowl, mix the maple syrup, soy sauce, garlic, garlic salt, and pepper. Place salmon in a shallow glass baking dish, and coat with he maple syrup mixture.
Cover the dish, and marinate salmon in the refrigerator 30 minutes, turning once.
Preheat oven to 400 F degrees Place the baking dish in the preheated oven, and back salmon uncovered 20 minutes, or until easily flaked with a fork.
Makes 4 servings.