they may be loose, but they must fall beneath the inside middle of the springform pan
then beat the egg whites and some sugar until stiff peaks form
use an electric handheld mixer or a sturdy wire whisk to incorporate the yolks with some melted butter and milk
the mixture will be very light in color and should be almost double in size
take the time to fold the flour in properly, turning the bowl 1/4-turn after each pass with your spatula
notice my pan is wrapped in foil and placed onto a baking sheet - DO THIS!
the top will be slightly hard, nicely golden brown, and will not "jiggle" when you gently shake the springform