Firstly, cream your butter and icing sugar until light and fluffy.

Add ur egg and flavour and mix well.

Add d flour and cornstarch and mix together until it is crumby.

Then use ur hands and roll it in a round shape like a ball and use ur fork to press it down. Put some sprinkles own. Although it's optional

Pre heat ur oven to 180 celcius. Grease ur baking tray and place d cookies and bake for 20 minutes.