Beat the butter with the powdered sugar into a light, airy mixture.

Add the baking powder and zest, and mix.

Add the flour and knead the dough by hand, but only briefly. Gather the dough into a ball and put it in the fridge for 20 minutes.

Roll out the dough into a very thin sheet, about 2 mm thick, and cut out cookies using cutters.

Bake in an oven preheated to 180-190C for 10-15 minutes. The finished cookies should be golden and very fragrant. Bon appetit!