Heat oven to 350 degrees
Stir together 2 cups flour and 1/2 cup sugar in a medium bowl.
Cut in butter with pastry blender until mixture resembles coarse crumbs. Press mixture onto bottom of 13x9 inch baking pan.
Bake 25 minutes or until lightly browned. Remove from oven, sprinkle chips over crust.
Stir together eggs, lemon juice, lemon peel and remaining 1/2 cup flour and remaining 1 1/2 cup sugar in a medium bowl, carefully pour over chips and crust.
Bake 25 minutes or until set.
Cool slightly in pan on wire rack, sift powdered sugar on top.
Cool completely, cut in bars.
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