In a large bowl mix flour, sugar and Baking powder.
Use cold butter – and chop it into as small pieces as possible (if you have a pastry cutter it is perfect for this).
Add butter to flour mixture – add lemon rind, vanilla, and eggs and mix, using your hands, until dough forms a ball. You may have to add flour if dough is very sticky. Cover ball with plastic wrap and refrigerate for at least two hours (overnight is fine).
Preheat oven to 350 degrees.
Cut the ball of dough in quarters and roll out, on floured surface, until 1/4” thick.Cut the dough into even circles. I use a water glass to cut dough – but any 3”- 4” round cookie cutter will do.