2 1/4 c. sifted all purpose flour
1 c. powdered (confectioners) sugar
1 c. melted butter
2 c. white sugar
1 tsp baking powder
5/8 c. lemon juice
(Really? Why can't it say just a little over 3/4 c.?)
While the crust is baking, squeeze 5/8 cup of lemon juice from fresh lemons (or you can use store-bought lemon juice).
In a large bowl, beat four eggs until light. Combine the granulated sugar, baking powder and 1/4 c. of flour in a separate bowl. (This is an extra 1/4 c. flour different from that used in the crust.) Slowly blend the sugar mixture into the beaten eggs and then add the lemon juice.
Pour into the prepared crust while it is still hot and return to the oven for 30 minutes.
The squares should be golden brown when they come out of the oven. Sprinkle some powdered sugar on the top, allow to cool completely, and enjoy!