Combine 2 cups flour and ½ cup powdered sugar in a medium bowl.

Cut in butter with a pastry blender (or fork) to make fine crumbs.

Press mixture into a 9×13-inch baking pan, pressing ½ inch up the sides.

Bake at 350 F for 15-20 minutes, until just golden brown at edges.

For filling, mix sugar, ¼ cup flour and baking powder; add lemon juice, lemon zest and eggs. Pour mixture over hot crust. Bake 20 additional minutes at 350 F. Cool completely.

Sprinkle lightly with powdered sugar. Cut into bars.