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["*NOTE:Original recipe used 1 T butter, softened.", "**NOTE:Original recipe used 1 T canola oil.", "***NOTE:Original recipe used 2 lg egg whites, divided.", "Preheat oven to 350 deg F.", "Lightly coat an 8 x 12"" or 7 x 11"" baking pan with cooking spray.", "In small bowl, stir together 1 C flour, 1/4 tsp baking powder, baking soda and salt.", "In mixing bowl, beat together 1/2 C sugar, lowfat margarine.", "(butter), oil, egg white and lemon rind (zest) with electric mixer until smooth.", "Stir in dry ingredients until blended and crumbly.", "Note: Mine never did get crumbly-- it was a batter.", "Press dough in an even layer in baking pan.", "Note: I just poured it.", "into the baking pan.", "Bake the crust 15- 20 min or until it is puffed all.", "over and browned around the edges.", "Meanwhile, in bowl, combine the remaining 3/4 C sugar, 2 tsp lemon zest, lemon juice, egg, the flour and 1/4 tsp baking powder; whisk until smooth.", "Pour evenly over hot crust and bake about 14- 20 min longer, or until set.", "Let cool completely in pan on a wire rack.", "Cut into squares and dust with.", "confectioner's sugar.", "Note: I omitted the confectioners sugar."]