In a large bowl or stand mixer, cream together butter and sugars. Add Biscoff spread, mix well. Scrape bowl prior to each new addition or as needed. Add egg and vanilla, mixing just until combined. Mixing on low, add dry ingredients: salt, baking soda, flour and oats. Mix well until all ingredients are blended together. Pour in chocolate chips and mix by hand.
Prepare baking sheets with silicone baking mats or parchment paper. Using a medium cookie scoop, scoop dough and space at least 2" apart on your baking sheet. Gently press down to flatten out into a thick disc.
Bake for 10-12 minutes or until desired crispness is reached. Let stand on baking sheet for 1-2 minutes before transferring to a cooling rack. Store in an airtight container.