In a bowl add in the butter,egg,egg white and sugar,mix with a whisk till well combined.Add the orange juice and zest and mix.

Sift in the flour and baking powder into the mixture gradually and combine well using your hand.knead the dough well till well combined and smooth,Pat down cover and keep in the fridge for about 30 mins.After 30 mins place the dough on parchment paper and divide into two.

Work with one dough first,put another parchment paper on top of the dough and press down with your hands.Roll out using a rolling pin and use a round cutter to cut out circle shapes.Repeat with remaining dough.Transfer them onto a baking sheet lined with parchment paper.Mix the egg yolk with the yoghurt and brush the top of the cookies then use a fork to make swirling designs.

Bake in a preheated oven at 170C for 25 mins. Transfer on to a wire rack to cool. Store in an air tight container once cooled completely.Enjoy!