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Preheat oven to 300°F Grease a 9x13 baking pan.
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In a large bowl, combine flour with cornstarch and salt.
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In a separate bowl, beat butter with icing sugar and vanilla until very creamy. Stir in flour mixture, then cranberries and chocolate chips. Using floured fingers, pat evenly into prepared pan. Using a fork, prick surface all over.
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Bake in preheated oven for 40-50 minutes or until deep golden around the edges.
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Let stand in pan on wire rack for 30 minutes.
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Slice into bars while still warm, cool completely. Dust with icing sugar, if desired.
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Makes 48 bars and they freeze great.