Preheat oven to 325ºF.
Grease a 9X13 cake pan, and line the bottom with parchment paper.
Combine all crust ingredients in a food processor and process until it looks like sand.
Press into the bottom of prepared pan.
Bake until golden approximately 25 minutes.
In a bowl, beat eggs.
Add sugar and beat until pale and thickened.
Add flour, baking powder, lemon juice and lemon rind.
Blend until smooth.
Pour filling over pre-prepared cookie crust.
Place in oven and bake until filling is set, approximately 25 to 30 minutes.
Remove from oven.
Set pan on cooling rack and let completely cool.
