Line 8-inch square pan with Reynolds Wrap® Aluminum Foil. Combine first 3 ingredients in medium bowl. Cut in margarine with pastry blender or 2 knives until mixture resembles coarse crumbs; press onto bottom of prepared pan. Bake 15 min.
Beat Neufchatel and granulated sugar with mixer until blended. Add eggs and 2 Tbsp. flour; mix well. Blend in 1 Tbsp. lemon zest, juice and baking powder; pour over crust.
Bake 25 to 28 min. or until center is set. Cool completely. Refrigerate 2 hours. Sprinkle dessert with powdered sugar and remaining zest just before serving.