In the bowl of a stand mixer fitted with a paddle attachment, beat cream cheese on low speed until smooth, about 5 minutes. Scrape down sides of bowl as needed to ensure thorough mixing.
Add in brown sugar and salt. Mix on medium speed until well incorporated, about 3 minutes. Add in Biscoff cookie butter spread. Mix on medium speed until thoroughly distributed, about 1 minute. Scrape down sides of bowl as needed.
With the mixer running on low speed, add eggs one at a time, ensuring each egg is incorporated before adding the next. Scrape down sides of bowl as needed. Add sour cream, heavy cream, and vanilla extract. Mix on low speed until batter is homogenous and there are no longer any streaks of white.
Wrap cooled springform pan in heavy duty foil. Use enough foil to ensure water cannot seep through the bottom of the springform pan. (To be safe, you may want to add two or three layers of foil.) Set aside.
Bring about 6-8 cups of water to a boil (you may need more water depending on the size of your roasting pan).
Pour cheesecake filling into the foiled wrapped springform pan. Use a mini offset spatula or the back of a spoon to spread filling into an even layer. Place pan the center of a large roasting pan.
Transfer roasting pan to the center rack of 325℉ oven. Pour boiling water into roasting pan until about 1 ½-inch of springform pan is submerged in water.
Bake cheesecake for 60 minutes.
Turn off oven heat. Crack oven door slightly ajar to slowly let the oven and cheesecake cool for 45-60 minutes. (If oven door will not stay open, prop the door open with a wooden spoon.)
Remove roasting pan from oven. Remove cheesecake springform pan from water bath. Let cheesecake sit at room temperature for about 30 minutes until completely cooled. Once cooled, keep chilled in the fridge until ready to serve.