INGREDIENTS
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1/2 cup butter, softened
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1 cup sugar
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1 large egg
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1 1/4 cups flour
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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1/2 cup sour cream
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1/2 teaspoon pure vanilla extract
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1/2 cup walnuts
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1/4 cup light brown sugar, firmly packed
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1 tablespoon sugar
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1/2 teaspoon cinnamon