Step 2: In a medium bowl, combine the Biscoff cookie crumbs and melted butter. Mix until the crumbs are evenly moistened. Press the mixture firmly into the bottom of the prepared pan to form the crust.
Step 3: In a large mixing bowl, beat the cream cheese and sugar together until smooth and creamy. Add the sour cream and vanilla extract, and mix until well combined.
Step 4: Add the eggs, one at a time, beating well after each addition. Scrape down the sides of the bowl as needed.