Add the flour, baking powder, caster sugar and salt to a bowl and mix
Add the lemon zest, eggs, oil and mix
Add to a bowl and chill for an hour
Preheat the oven to 190ºc/170ºfan and line two large baking trays
Grab tablespoon scoops of the cookie dough and roll into a ball
Roll these into icing sugar and place onto the trays
Bake in the oven for 10 minutes
Leave to cool and enjoy
