INGREDIENTS
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For the Cookies
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1 cup unsalted butter, softened
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3/4 cup firmly packed light brown sugar
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1/2 cup granulated sugar
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2 large eggs
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1 teaspoon pure vanilla extract
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1 1/2 cups all-purpose flour
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1 teaspoon baking soda
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1 teaspoon ground cinnamon
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1/2 teaspoon salt
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3 cups quick or old fashioned oatmeal
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For the Cream Filling
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3/4 cup (1 1/2 sticks) cup unsalted butter, softened
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2 1/2 cups confectioners' sugar, sifted
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1 teaspoon pure vanilla extract
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1 tablespoon milk or half and half