Swiss Parmesan Halibut

Bahan-bahan (6 porsi)

• 1½ pounds 1-inch thick halibut steaks or fillets, (skin removed- sliced into 6 portions)
• ¼ teaspoon salt
• ¼ cup shredded smoked Swiss cheese
• ¼ cup low fat sour cream
• ¼ cup fat-free plain yogurt
• 3 tablespoons thinly sliced green onions, (divided)
• ⅛ cup grated Parmesan cheese