Preheat oven to 350 degrees.
In a large bowl, beat the flour, butter and confectioners’ sugar until blended.
Press onto bottom of an ungreased 8-inch square baking dish. Bake for 15–20 minutes or until lightly browned.
In a large bowl, beat eggs, sugar, flour, lemon juice, lemon extract, baking powder and salt until frothy; pour over hot crust.
Bake 10–15 minutes longer or until light golden brown. Cool completely in dish on a wire rack. Dust with the confectioners’ sugar. If desired, sprinkle with orange peel strips.