The topping puffs up slightly to a golden brown. It's a perfect topping for a mild fish. I never had good luck cooking under a broiler, so I wrapped the fish in foil and baked at 400 degrees for about 15 mins. Then I carefully transferred the filets to a foil-covered baking sheet, topped with the egg mixture and broiled about 5 mins. Don't prepare the topping too far in advance, it becomes watery.