Preheat the oven to 180°C.
Prepare the baking trays either by lining them with parchment paper or lightly greasing them with butter.
Sift flour, baking powder, baking soda and salt together into a large bowl.
Add butter and sugar in a large mixing bowl.
Cream them together either using by using a spatula or hand held electric whisk or mixer.
Cream till it becomes soft and creamy.
Add the egg, vanilla extract, zest and juice. Mix well.
Add the flour mixture.
Using your hand, mix gently and form a dough. Once all the ingredients come together in the form of a dough, leave it. Don’t over mix.
Take a tablespoon of the dough and roll it into a ball.
Add extra sugar into a small bowl or plate.
Roll the ball in it.
Place on the baking tray.
Repeat the above steps with the remaining dough.
Make sugar you place the rolled balls at least an inch apart, as the cookies with spread out during the baking time.
Bake them for 10-12 minutes or until the sides or bottom are light golden in colour.
Remove the cookies from the oven.
Allow the cookies to rest on the baking tray for 5 minutes.
Place them on a wire rack to cool completely.
Store the cookies in an airtight container till required.