Lightly grease a 9-inch springform pan and line the bottom with parchment paper.
Stir together crushed Biscoff cookies and melted butter until evenly combined.
Press firmly into the bottom of the pan and freeze while preparing the filling.
Beat cream cheese, powdered sugar, and vanilla until smooth and creamy with no lumps.
In a separate bowl, whip the heavy cream to stiff peaks.
Gently fold into the cream cheese mixture until smooth and thick.
Spread the cheesecake filling over the chilled crust and smooth the top with an offset spatula.
Chill for at least 6 hours or overnight.
Microwave the Biscoff cookie butter in 10–15 second bursts, stirring between each, until just pourable.
Let it cool slightly, then spread over the cheesecake. It will firm up as it chills.
Pipe whipped cream around the edges and sprinkle with crushed cookies.