Step 1

Preheat the oven to 350°. The best pan for these bars is a glass bread loaf pan measuring 9” x 5” x 3”. If you only have a metal loaf pan, line the pan very well with parchment paper. You do not want the acidic lemon curd to touch the sides of the metal pan.

Step 2

First, make the shortbread crust: In a medium bowl, add all crust ingredients. Use your fingers or a pastry blender to rub the butter into the flour, sugar and salt. You should have a coarse meal. Press this mixture into the bottom of the loaf pan firmly. Bake for 25 minutes, or until the edges are slightly browned and the top is not wet to the touch.

Step 3

Once you remove the pan from the oven, you may then start making your filling. (Do not make the filling ahead of time and let it sit---eggs and lemon juice aren't the best of friends). In a small bowl, beat with a hand-held electric mixer the granulated sugar, lemon juice, lemon zest, whole egg and egg yolk. Beat this mixture very well until it becomes frothy--about 1 minute.

Step 4

Beat in the baking powder and flour until no lumps remain. Pour this mixture over the crust that has been cooling. Return the pan to the oven for another 20-23 minutes, or until the filling is set.

Step 5

Immediately remove the bars from the loaf pan and allow to cool before dusting with powdered sugar and cutting into bars.