INGREDIENTS
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1 1/4 cups all-purpose flour, lightly spooned into measuring cups and leveled with a knife
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1 teaspoon baking powder
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1/2 teaspoon salt (omit if using salted butter)
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2/3 cup Dutch-process unsweetened cocoa powder
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1/2 cup (1 stick) butter
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1/2 cup sugar
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1/2 cup dark brown sugar
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1 1/2 teaspoons vanilla
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1/2 teaspoon hazelnut extract (you can substitute 1/2 teaspoon vanilla if you can’t find or don’t like hazelnut extract)
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1/3 cup Nutella
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1/3 cup milk