1. Preheat oven to 160 degrees Celcius.
2. Grease and line a slice pan
3. Melt the butter. Pop aside
4. In a food processor, pulse the speculoos cookies until you get a fine crumb. Add butter and mix. Press the crumb tightly into the bottom of the lined baking pan. Bake for 12 minutes. Remove from the oven and set aside.
5. With an electric mixer, beat the cream cheese until smooth. Add the Biscoff and mix through. Scrape down the bowl and beaters.