"A gooey, salted caramel filling and a sprinkle of cinnamon-sugar make these cookies extra special...."
INGREDIENTS
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2 1/4 cups all-purpose flour (see Cook's Note)
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1 teaspoon cream of tartar
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1/2 teaspoon kosher salt
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1 1/4 cups sugar
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1 1/2 sticks (12 tablespoons) unsalted butter, melted and cooled
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1/2 teaspoon pure vanilla extract
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1 large egg, at room temperature
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4 teaspoons ground cinnamon
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1/4 cup sugar
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1 1/2 tablespoons unsalted butter, at room temperature
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2 tablespoons heavy cream, at room temperature
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1/8 teaspoon kosher salt
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Flaky sea salt, for sprinkling