INGREDIENTS
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For the bars::
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1 1/2 cups (6.75 ounces) all-purpose flour
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1 teaspoon ground cinnamon
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1/4 teaspoon ground ginger
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1/4 teaspoon ground nutmeg
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1/4 teaspoon baking soda
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1/4 teaspoon salt
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1 stick (4 ounces) unsalted butter, melted
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2/3 cup packed light brown sugar
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1 large egg
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1 teaspoon vanilla extract
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1 cup (7.5 ounces) pumpkin puree
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For the frosting::
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1 stick (4 ounces) unsalted butter, at room temperature
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1/4 cup light brown sugar, packed
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1/2 teaspoon ground cinnamon
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1/8 teaspoon salt
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1 1/2 cups powdered sugar, sifted
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1/2 teaspoon vanilla extract
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1 tablespoon milk, plus more if needed