1.Season Fillets With Salt And Pepper, Onion Powder, And Red Pepper Flakes. Set Aside In A Baking Dish. 2.In A Medium Bowl, Mix Together Olive Oil, Lemon Juice, Garlic, Balsamic Vinegar, Sugar, Green Onions, And Cilantro. Pour Marinade Over Salmon; Cover, And Refrigerate Overnight, Or At Least 6 Hours. 3.Preheat Oven To 450 Degrees F (230 Degrees C). 4.Arrange Salmon On A Broiling Sheet. Place In A Preheated Oven, And Bake For 5 Minutes. Increase Heat To 500 Degrees F (260 Degrees C), Turn Fillets, And Broil 5 Minutes More.