Prep the pan. Line the base of a springform pan with parchment. Lightly grease the sides. This helps with clean release and neat slices.
Make the crust. Combine crushed Biscoff cookies, melted butter, brown sugar, and a pinch of salt.Stir until the crumbs feel like wet sand and clump when pressed.
Press and chill. Firmly press the mixture into the pan base (use the bottom of a measuring cup). Aim for an even, compact layer. Chill 15–20 minutes to set.
Whip the cream. In a cold bowl, whip heavy cream to medium-stiff peaks.Don’t overwhip. Set aside in the fridge.
Beat the cream cheese. In another bowl, beat cream cheese with sugar, vanilla, lemon juice, and salt until smooth and fluffy, about 2 minutes. Scrape down the bowl.
Add the cookie butter. Warm the Biscoff spread slightly (10–15 seconds in the microwave) to loosen, then beat it into the cream cheese mixture until fully combined and silky.
Fold in the cream. Gently fold the whipped cream into the filling in two additions.Keep the mixture airy and smooth.
Fill the crust. Spoon the filling onto the chilled crust. Smooth the top with an offset spatula. Tap the pan gently on the counter to remove air bubbles.
Chill to set. Cover and refrigerate for at least 6 hours, preferably overnight.The longer chill gives cleaner slices and a firmer set.
Make the topping. Warm cookie butter with 2–3 tbsp cream until pourable but not hot. Let it cool to just warm so it doesn’t melt the cheesecake.
Glaze the cheesecake. Release the chilled cheesecake from the pan. Pour the topping over the surface and tilt the cake to spread, or use a spatula for a smooth finish.
Garnish and serve. Add crushed or whole Biscoff cookies around the edges.Chill 20–30 minutes to set the topping, then slice with a warm, clean knife.