Combine flour, confectioner's sugar, and margarine and mix until crumbly. Press into greased 8x8 pan and bake at 350 until lightly browned, about 20-25 minutes. Beat together eggs, sugar, lemon juice, flour, baking powder and lemon peel until frothy. Pour mixture over baked crust and bake at 350 for 25 minutes. Sprinkle lightly with powdered sugar. Cut into squares when cool.
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