Add softened butter, sugar and vanilla to a stand mixer. Beat on medium until light and fluffy.
Scraping down the sides of the mixing bowl, add the egg and beat until just combined.
Add the flours, baking powder and ruby chocolate chunks (or ruby chocolate chips). Mix until just combined. If you’re mixing by hand melt the butter completely in the microwave and use caster sugar so the sugar will combine more readily than regular white sugar.
Roll tablespoons of mixture into balls. Flattening each ball slightly, place on a lined baking tray, leaving about 5cm apart to allow room for the cookies to spread while baking.
Bake in the oven at 160°C for 12 minutes or until slightly golden brown around the edges. You may need to bake them for 2 minutes less or 2 minutes more depending on your oven.
Allow to cool completely before removing them from the tray.