"Soft, cinnamon spiced cookie bars, topped with a cinnamon buttercream frosting...."
INGREDIENTS
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½ cup (1 stick) unsalted butter, softened
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⅔ cup granulated sugar
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¼ cup light brown sugar
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1 egg
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1 egg yolk
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1 teaspoon pure vanilla extract
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2 tablespoons sour cream
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1½ cups all purpose flour
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1 teaspoon cream of tartar
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½ teaspoon baking soda
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½ teaspoon salt
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1½ teaspoons ground cinnamon
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½ cup (1 stick) unsalted butter, softened
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3 cups powdered sugar, sifted
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2 tablespoons half and half or cream
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½ teaspoon pure vanilla extract
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1½ teaspoons ground cinnamon
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2 teaspoons cinnamon sugar, for topping