INGREDIENTS
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12 tablespoons unsalted butter, softened
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2/3 cup sugar
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1/3 cup firmly packed brown sugar
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1 large egg
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1/2 teaspoon vanilla extract
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1 large banana
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3/4 cup instant (1 minute) oats
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1 3/4 cups all-purpose flour
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1/2 teaspoon salt
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1 teaspoon baking powder
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1 1/4 cups California walnuts, toasted and chopped