INGREDIENTS
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1/2 cup (1 stick) unsalted butter, melted and kept warm
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1/2 cup plus 2 tablespoons buckwheat flour
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1/4 cup all-purpose flour
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1/4 cup whole wheat flour
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1/2 teaspoon baking soda
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1/2 teaspoon sea salt
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1/4 cup packed light brown sugar
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1/4 cup white granulated sugar
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1 egg
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3/4 teaspoon pure vanilla extract
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1 cup coarsely chopped bittersweet chocolate (60 - 70% cacao mass)
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1/2 cup walnuts toasted, cooled, coarsely chopped