Take a 13- by 9- by 2-inch baking dish. Melt 1/2 cup butter in the dish. Put the halibut on top of the melted butter, sprinkle with garlic powder and dill. Spread 1 1/2 cups shredded cheese on top of the halibut. Garnish with nuts, chopped or silvered.
Bake at 350 degrees for 45 minutes or until fish can be separated easily with a fork.