1Make homemade caramel sauce: add sugar to a pan and cook it on low heat until melted and golden. Add softened butter, then warm cream; whisk until creamy. Add salt and vanilla; let cool.
2For the crust, use Biscoff cookies and pulse in a food processor until crushed. Press into a springform pan and bake.
3In a mixer, beat together cream cheese, sugar, and vanilla until creamy. Make sure to scrape the bowl multiple times.
4Whisk eggs in a separate bowl, then slowly pour into the cream cheese mixture while whisking.
5Add heavy cream, sour cream, and cornstarch; whisk to combine.
6Add salted caramel sauce and mix until combined.
7Pour filling into the baked crust, tap out air bubbles, and bake in a water bath.
8Let the cheesecake cool overnight.
9Drizzle remaining salted caramel sauce over the cooled cheesecake.