Preheat Oven To 450 Degrees F (230 Degrees C). Place The Salmon On A Large Piece Of Foil, And Season With Garlic, Dill, Salt, And Pepper. Seal Foil Around The Salmon. Place On A Baking Sheet. Bake 20 Minutes In The Preheated Oven. Top With Cheddar Cheese And Green Onions, And Continue Baking 5 Minutes, Or Until Cheese Is Melted And Fish Is Easily Flaked With A Fork.