INGREDIENTS
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6 ounces dark brown sugar
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3 1/2 ounces rolled oats
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4 ounces all-purpose flour
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1/2 teaspoon baking powder
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1/2 teaspoon freshly ground allspice
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1/2 teaspoon freshly grated nutmeg
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1/4 teaspoon kosher salt
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1/4 cup unsalted butter, at room temperature, plus extra for the cooker
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20 ounces frozen peach slices