INGREDIENTS
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2 tablespoons unsalted butter, melted, plus 1 teaspoon unsalted butter, softened, for pan
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1/2 cup whole-wheat flour
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3/4 cup all-purpose flour
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1/4 cup ground golden flaxseed (from about 2 tablespoons whole)
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3/4 teaspoon coarse salt
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1/2 teaspoon baking powder
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1/2 teaspoon baking soda
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1 large egg, plus 1 large egg white
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1/2 cup light-brown sugar
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1 1/2 teaspoons pure vanilla extract
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3/4 cup mashed very ripe bananas (about 2 medium bananas)
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1/2 cup walnuts (about 1 3/4 ounces), toasted and coarsely chopped