Preheat oven to 350 degrees.
Beat together flour, butter and powdered sugar until well blended. Press into bottom of 18-inch-square pan. Bake for 25-30 minutes until lightly browned and just set. Remove from oven and maintain oven temperature.
Meanwhile, beat together eggs, sugar, baking powder, salt and lemon juice until smooth. Pour over hot crust. Bake an additional 20 minutes or until bubbly, lightly browned and just set.
Cool completely in pan on wire rack. Dust lightly with powdered sugar. Cut into squares and serve.
200, 2005, 2008
3 Points Each; 55 for Entire Recipe