Baked Seafood au Gratin Recipe

Ingredients

• 1 pound haddock or cod fillets, cut into six pieces
• 1/2 pound sea scallops
• 4 tablespoons butter, divided
• 2 tablespoons all-purpose flour
• 1/8 teaspoon pepper
• 1 cup chicken broth
• 1/2 cup 2% milk
• 1/2 cup grated Parmesan cheese, divided
• 1/2 cup shredded part-skim mozzarella cheese, divided
• 1/2 cup shredded cheddar cheese, divided
• 1-1/2 cups sliced fresh mushrooms
• Minced chives, optional