In a medium bowl, add the dry ingredients - flour, baking soda, and salt. Set aside.
In a large bowl, add the browned butter and both sugars. Whisk well, and add the eggs and the vanilla extract. Mix until everything is combined.
Fold in the dry ingredients, just until everything's incorporated.
Add in the chocolate chips and biscoff cookies and fold until everything's a smooth mixture.
Scoop cookies & set in the fridge for 1 hour or in refrigerator for 20 min, to firm the dough.
In the meantime, preheat your oven at 180c & line a baking sheet with parchment paper.
Once your dough is out, you can either place the cookies directly to bake or take each scoop, lightly open the dough with your fingertips, add a tbsp of biscoff filling, close them up and then place them in your prepared pan.
Bake these for about 10-13 minutes or until the edges are golden and the middle is slightly soft.
Allow the cookies to cool for 10 minutes before enjoying! ✨