Soufflés look most impressive when they rise dramatically over the rim of the dish. To create a beautiful crown on your soufflé, fill the dish about 3/4 full. If it's less full, the soufflé may not rise over the rim. If it's more full, the soufflé may spill over unless you wrap the dish with a foil collar. Here's how to make one.
Cut a 15-inch-wide sheet of foil 4 inches longer than circumference of dish; fold lengthwise in thirds.