Cream together the room temperature butter and Biscoff until combined.
Add the sugars and beat together for a few minutes until light and fluffy. Remember to scrape down the bowl with a rubber spatula regularly.
Add the eggs, one at a time, mixing well after each addition then add the vanilla.
Sift in the dry ingredients and mix until just combined then stir in the chocolate chips/chunks.
Using a cookie scoop/ice cream scoop, portion out the dough and place on a parchment paper lined baking sheet then transfer to the fridge and allow to chill for at least 30 minutes but ideally overnight.
Pre-heat the oven to 350°F/180°C.
Place the cookies on parchment-lined sheet pans, spacing them a few inches/cms apart to give them some space for spreading.
Bake the cookies in a preheated oven for 10-15 minutes until the edges are crisp and golden brown but the centers are still slightly soft.