This is an all around favourite! Easy to make, easy to pack, and easy to eat!
In food processor or mixing bowl, combine flour, butter and sugar; mix well.
Press into greased and floured 8 inch square (2 L) baking pan.
Bake in 325°F (160°C) oven for 20 minutes or until golden.
In food processor or bowl, combine sugar, flour, baking powder, salt, eggs, lemon zest and juice; mix well.
Spread over base and return to 325°F (160°C) oven for 20 to 25 minutes or until nearly set.
Let cool in pan. Dust with icing sugar. Makes about 20 small squares.
20 servings