Ingredients

5 tablespoons butter, cubed1 medium onion, sliced and separated into rings1-1/2 pounds halibut or salmon steaks3/4 cup mayonnaise3/4 cup sour cream3/4 teaspoon garlic powder3/4 teaspoon seasoned salt3/4 teaspoon dried basil3/4 teaspoon dried thyme1/8 teaspoon pepper1/2 cup dry bread crumbs1 cup shredded Parmesan cheese

Preparation

Place butter and onion on a double thickness of heavy-duty foil (about 34 in. x 18 in.). Cut fish into serving-size pieces, removing and discarding the bones. Place over the onion.

In a bowl, combine the mayonnaise, sour cream and seasonings. Set aside 1/2 cup for serving. Spoon the remaining sauce over fish. Sprinkle with bread crumbs and Parmesan cheese. Fold foil around fish and seal tightly. Grill, covered, over indirect medium heat for 15-20 minutes or until fish flakes easily with a fork.