In a medium sauce pan, combine corn syrup and sugar and mix to combine. Over medium heat, bring mixture to a boil. Remove from heat and add cookie butter and butter.
In a large bowl combine cereal and crushed Biscoff cookies. Pour cookie butter sugar mixture over the cereal and cookies.
In a 9x13 pan lined with parchment paper, add mixture and flatten into pan.
In a glass measuring cup, combine semi-sweet and butterscotch chips. Heat in the microwave in 30-second intervals until melted. Pour chocolate mixture over bars.
Allow to cool and then slice.
Recipe by Dining with Alice at https://diningwithalice.com/desserts/cookie-butter-scotcheroos/