Preheat oven to 350℉ and line a 9x13 baking dish with parchment paper
Add butter to a large mixing bowl, and melt in the microwave
Add in the granulated sugar and light brown sugar, and mix with a rubber spatula until well combined
Stir in cookie butter and vanilla extract
Add eggs, and mix until fully combined
Gently mix in 1 cup flour, baking powder, sea salt and cinnamon until barely combined
Add in remaining 1 cup flour, and mix until just combined
Gently fold in 1 cup of chocolate chips and 7 crushed Biscoff cookies
Evenly spread mixture in prepared baking dish
Top with remaining ½ cup chocolate chips and 3 crushed Biscoff cookies
Bake for 20-25 minutes, or until dough no longer looks greasy and a toothpick inserted comes out clean
Remove from oven, and allow to cool slightly before removing from pan
Slice into squares, and store in an airtight container