INGREDIENTS
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1 cup buckwheat flour
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1 1/2 teaspoons white sugar
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1 teaspoon baking powder
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1/4 teaspoon salt
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1/4 teaspoon baking soda
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1 1/4 cups buttermilk
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1 large egg, beaten
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1/4 teaspoon vanilla extract
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1 tablespoon unsalted butter, or as needed