WHIP THE EGG WHITES TO SOFT PEAKS
One of the most important tips to creating a crack free sponge cake is only whipping the egg whites to soft peaks. If the meringue is whipped to stiff peaks it can cause the cake to rise rapidly while baking, increasing the possibility of the top splitting.
ADD THE SUGAR WHEN THE EGG WHITES ARE JUST FOAMY, AND WHIP UNTIL A DENSE MERINGUE
While the egg whites should be whipped to soft peaks it is important to ensure that the soft peaks are dense and stable. The best way to create a stable meringue is to add the sugar as soon as the egg whites are foamy and beat the egg whites on medium-low for a longer period of time. This gives time for the sugar to dissolve, and the proteins in the egg whites to form a stronger network. When you look at the meringue the air bubbles should be fine and the surface should be shiny.
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