01 - In a large mixing bowl, beat the heavy cream with 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. Fold until the mixture is smooth and uniformly blended, being careful not to deflate the whipped cream.
03 - Pour the mixture into a parchment-lined loaf pan and smooth the surface with a spatula. Cover tightly and freeze for at least 4 hours or until completely firm.
04 - Remove the ice cream from the freezer and let it sit at room temperature for about 5 minutes to soften slightly for easier scooping.
05 - Place 8 Biscoff cookies flat side up on a baking sheet. Scoop approximately 1/4 cup of ice cream onto each cookie, then top with a second cookie. Press down gently to spread the ice cream evenly to the edges.
06 - Roll the exposed ice cream edges of each sandwich in the crushed Biscoff cookies until well coated.
07 - Return the assembled sandwiches to the freezer for 10 to 15 minutes to firm up before serving.