Heat the butter in a medium pan on low heat until it melts.
Remove from heat and leave to cool.
Mix the sugars in the bowl of your stand mixer using the paddle attachment.
Pour in the butter and mix until creamy.
Add the egg and mix for a minute to incorporate.
Mix the flours with the baking powder.
Add the flours and mix to make the cookie dough.
Add the date paste and mix to incorporate.
Put in the fridge for 30 minutes.
Preheat the oven to 350°F (180°C).
Line a baking tray with parchment paper.
Roll the dough into 9 balls (1 inch diameter each).
Put them on the tray.
Use a fork to press each ball of dough slowly.
Bake for 10 to 11 minutes.
Remove from oven and leave to cool on the tray.
Repeat the last 3 steps for the rest of the dough.