Meringue cookies 3 egg white (large egg) 3/4 cup granulated sugar 1 teaspoon vanilla 1/2 teaspoon distilled white vinegar Heat the oven at 200 degrees. Line parchment paper and cookie trays. Place egg whites in a stand mixer bowl fitted with a whisk and whip until stiff peaks hold and meringue does not slide out when bowl is turned upside.. Gradually add in sugar and then vanilla an by d vinegar. Increase speed and whip until mixture is free of sugar grit when rubbed between two fingers and the