INGREDIENTS
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1 cup (2 sticks) chilled salted butter
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2 3/4 cups all purpose flour
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1/2 cup old fashioned oats (ground)
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1 tablespoon baking powder
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1/3 cup sugar
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1/8 teaspoon salt
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1/2 teaspoon cinnamon
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1/2 teaspoon ginger
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1/4 teaspoon allspice
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1/2 cup heavy cream
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1/3 cup molasses
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1 egg
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2 1/2 cups powdered sugar
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3 tablespoons heavy cream
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1/2 teaspoon vanilla extract
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water by the teaspoon as needed