Pat fillets dry. Place 1/2 ... baking dish. Place halibut on top of onions and ... on top. Mix mayonnaise and sour cream and cheese; ... until fish flakes easily.
Preheat oven to 375 degrees. ... be substituted. Cut halibut into bite size pieces and ... lemon juice. Spread mayonnaise on top of halibut, use ... excess butter and serve.