In a large-sized mixing bowl, combine the heavy cream, milk, sugar, and vanilla. Whisk the mixture for about 2 minutes, until the sugar has dissolved.
Pour the mixture into your ice cream maker (this recipe is enough for a 2-quart bowl).
Turn your ice cream maker on and churn for 20 minutes.
At 20 minutes, slowly add 1 cup Biscoff spread to the mixture while the machine is churning.
Once the Biscoff spread is added, add the broken up cookie pieces.
Allow the mixture to churn for about 5 to 10 minutes, until the Biscoff spread and cookies are combined.
Turn the ice cream maker off and pour half of the ice cream into a 9x9 baking dish. Drizzle a couple tablespoons of Biscoff spread over the ice cream. Add the remaining ice cream, followed by more drizzle and some additional broken cookie pieces.
Freeze the ice cream for another hour or two to let it harden a bit more.