From America's Test Kitchen Season 13: Sunday Brunch
In order for the eggs to cook properly, it is critical to add them to the hot filling–lined ramekins quickly. Use 6-ounce ramekins with 3 1⁄4-inch diameters, measured from the inner lip. It is imperative to remove the eggs from the oven just after the whites have turned opaque but are still jiggly—carryover cooking will finish the job. We developed this recipe using a glass baking dish; if using a metal baking pan, reduce the oven temperature to 425 degrees. This recipe can be doubled. If doubling, bake the ramekins in two 13 by 9-inch dishes and increase the baking times in steps 3 and 4 by 1 minute.