Pre-heat oven: 195°C / 175°C (fan) / Gas Mark 5½ / 390°F
Cream together the butter and sugars until smooth.
Beat in the egg and vanilla.
Sift in the flour, baking powder and matcha, then add the salt and mix together until combined.
Add in the chocolate chunks, stirring through the dough until just evenly spread throughout.
Roll the dough into balls slightly larger than a walnut, and spread across baking trays lined with greaseproof paper. Put these into the fridge for 30mins before baking for a thicker cookie.
Bake the cookie dough balls in the oven for 8-10mins until lightly golden. Allow to cool then enjoy!
Notes
You can swap the plain / all-purpose flour in this recipe for self-raising flour of the same quantity, and remove the baking powder.