Beat Cream Cheese: In a large bowl, beat cream cheese for 3 minutes on medium speed until creamy.
Add Sugars: Mix in brown and granulated sugar, and beat for 2 more minutes.
Combine with Sour Cream and Biscoff: Add sour cream and Biscoff cookie butter, and mix. Scrape the bowl.
Add Vanilla and Salt: Mix in vanilla extract and salt.
Add Eggs: Mix in eggs one at a time until just combined. Avoid over-mixing to prevent cracks.
Prepare Pan: Pour the batter over the cooled crust. Grease the sides of the pan if needed.
Water Bath: Wrap the bottom of the pan in foil. Place in a larger roasting pan and add hot water to create a water bath.
Bake: Bake at 325°F for 60-70 minutes. It should jiggle slightly in the center with set edges.
Cool in Oven: Turn off the oven and let the cheesecake sit inside for 1 hour.
Chill: Remove from the oven and refrigerate for at least 6 hours.