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Heat oven to 350°F.
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Grease a 13x9 inch baking pan.
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Combine flour and powdered sugar in large mixing bowl.
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Cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs.
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Press mixture onto bottom of prepared baking pan. Bake for 8 to 10 minutes or until mixture appears dry.
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Sprinkle 1 cup morsels and 3/4 cup cranberries over hot cookie base.
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Beat egg whites in large mixer bowl until soft peaks form.
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Gradually add brown sugar and beat until stiff peaks form.
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Spoon meringue over morsels and cranberries. Carefully spread to edges.
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Bake for 14 to 18 minutes or until meringue topping is puffed and golden brown.
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While still hot out of oven, sprinkle with remaining morsels and cranberries. Cool completely in pan on wire rack.
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Cut into bars with sharp knife. Dip knife in warm water if it becomes sticky.