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Heat the oven to 350 degrees F and grease one 8x8x2 with the butter.Separate the eggs placing the whites in a medium-sized mixing bowl, and the yolks to another.Add the Nutella and cocoa powder to the egg yolks and mix until it's evenly blended. Set aside.Now, use the whisk attachment on an electric mixer, on a medium-high speed to whip the egg whites until stiff peaks form, about 2 to 3 minutes.You can also use a hand whisk -- it will just take a bit more time and energy.Fold the whipped whites into the Nutella mixture until they are fully incorporated. Then add the batter into the prepared pans. Bake in the preheated oven for about 20 minutes.
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