01 - In a large mixing bowl, beat the heavy cream using an electric mixer on medium-high speed until stiff peaks form, about 2 to 3 minutes.
02 - Gently fold in the sweetened condensed milk, vanilla extract, and melted Biscoff spread using a spatula. Combine until the mixture is smooth and uniformly blended without deflating the cream.
03 - Transfer the mixture into a loaf pan lined with parchment paper. Smooth the surface evenly and place in the freezer for at least 4 hours or until completely firm.
04 - Remove the frozen ice cream from the freezer and let it rest at room temperature for approximately 5 minutes to soften slightly for easier scooping.
05 - Arrange 8 Biscoff cookies flat side up on a baking sheet. Using an ice cream scoop, portion about 1/4 cup of ice cream onto each cookie. Top each with a second cookie and press down gently to form an even sandwich.
06 - Roll the exposed edges of each sandwich in the crushed Biscoff cookies, pressing lightly so the crumbs adhere to the ice cream.
07 - Return the assembled sandwiches to the freezer for 10 to 15 minutes to firm up before serving.