INGREDIENTS
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For the Cake:
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1 cup (125 grams) all purpose flour
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1 1/4 cups (250 grams) granulated sugar
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1/4 cup plus 2 tablespoons (45 grams) Dutch process cocoa powder (I used Valrhona)
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1 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup (120 ml) vegetable oil
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1/2 cup (113 grams) sour cream
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3/4 cups room temperature water
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1 tablespoon white vinegar
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1 teaspoon pure vanilla extract
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1 large egg, at room temperature
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For the Frosting:
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4 large egg whites (4 ounces, 113 grams)
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4 ounces (113 grams) granulated sugar
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pinch of salt
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1 1/2 cups unsalted butter, at room temperature and cut into 2 inch chunks
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1/2 cup (130 grams) Nutella