Sift plain flour and baking powder in a bowl, set aside.
Beat butter and sugar till pale and fluffy. Slowly add in beaten egg and vanilla extract, mix well followed by the plain flour and baking powder, mix well again.
Lastly pour in the berries and fold well with a rubber spatula.
Shape the cookie dough using a dessert spoon then using a knife to push the dough onto the baking sheet.
Bake at preheated oven at 180 deg C for 20-25 minutes or till golden brown. Cool the cookies completely and store into an airtight container.
Recipe by Anncoo Journal at https://www.anncoojournal.com/berry-cookies/