1 Preheat the oven and prep your pans: Preheat your oven to 400°F. Brush the inside of a 9x13x3-inch cake pan with a thin layer of the melted butter.
Place 1/2 cup of the granulated sugar into an oven-safe container and let the sugar warm in the oven as it’s heating up. Warm sugar helps give the egg yolks more volume when you whip them.
2 Whip the yolks: Using a hand or stand mixer, whip the egg yolks, the warmed sugar, and the vanilla extract together on medium-high speed until the egg yolks have doubled in volume and are a very pale yellow color. This should take about 5 minutes. Set the bowl aside.
3 Whip the egg whites: In a separate, very clean bowl with clean beaters, whip together the egg whites and the salt on medium-high speed until the whites are foamy.
Once the whites look foamy, gradually add the remaining 1/4 cup plus 1 tablespoon of sugar to the egg whites….
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