INGREDIENTS
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2 cups unbleached all-purpose flour
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1/4 cup granulated sugar
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1/4 cup dark unsweetened cocoa powder (like Valrhona)
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1 tablespoon baking powder
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1/2 teaspoon salt
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6 tablespoons (3/4 stick) cold unsalted butter, cut into chunks
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1 large egg
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1/2 cup heavy cream
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3/4 cup toasted hazelnuts,coarsely chopped
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1/2 cup Nutella