"This extravagant dessert has everything: ice cream, nuts, fluffy marshmallow, and enough satisfyingly cakey bits to hold it all together. Sometimes more is better...."
INGREDIENTS
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Unsalted butter, for pans
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2/3 cup all-purpose flour, plus more for pans
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2/3 cup sugar, divided
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1/2 cup unsweetened cocoa powder
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1 teaspoon baking powder
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1 teaspoon baking soda
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1/2 teaspoon coarse salt
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1/2 cup safflower oil
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1/3 cup warm water
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1 teaspoon pure vanilla extract
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3 large eggs, room temperature, separated
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4 large egg whites, room temperature
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1 cup sugar
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1/4 teaspoon cream of tartar
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1 teaspoon pure vanilla extract
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3 pints chocolate ice cream (6 cups), slightly softened
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1 cup chopped toasted skinned hazelnuts