Preheat the oven to 350°F and line a sheet pan with parchment paper.
Whisk together the flour, baking soda, baking powder and salt in a small bowl. Set aside.
Using mixer, add butter and sugars and mix on medium speed for 1-2 minutes so it is fully combined.
Add the egg and vanilla and beat until combined, then mix in the Biscoff cookie butter for another 30 seconds – 1 minute.
Add the flour mixture and beat until just combined. Stir in any add-ins you wish.
Scoop out large rounded spoonfuls of dough using a cookie scoop or large spoon. Place on the prepared sheet pan 2 inches apart and slightly press down cookie balls, not too much though, we want them thick!
Bake 12-14 minutes, or until the edges are cooked and golden. Cookies will continue baking after you pull them from the oven, even though they may still appear a little gooey on the inside. That’s perfect, you don’t want to overbake the cookies.
Transfer to a wire rack and cool 10 minutes before serving..