"Buttery shortbread bars with a layer of caramel in the center...."
INGREDIENTS
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1 stick (4 ounces) unsalted butter
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1 cup plus 3 1/2 teaspoons (5.5 ounces) all-purpose flour
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1/2 teaspoon baking soda
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1/2 scant teaspoon Kosher salt
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1/2 cup firmly packed light brown sugar
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1 egg yolk
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1/4 teaspoon vanilla extract
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3 circles of candy apple caramel
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2 tablespoons (approximately) miniature chocolate chips or chopped nuts