Prepare Crust: Crush biscoff cookies. Mix with melted butter. Press into a lined 9-inch springform pan. Chill in the fridge.
Make Cheesecake Batter: Preheat oven to 325°F. Beat cream cheese, sugar, yogurt, vanilla, and cinnamon until smooth. Add eggs one at a time, mixing on low speed until combined.
Bake Cheesecake: Pour batter into chilled crust. Place pan on the middle rack of the oven with a water bath on the bottom rack. Bake for 60-65 minutes.
Cool: Turn off the oven and let the cheesecake cool with the door ajar for 1 hour. Cool at room temperature for 1-2 hours, then chill in the fridge for at least 4 hours or overnight.
Make Caramel: Melt sugar in a saucepan until amber. Slowly stir in heavy cream, then stir in butter and salt. Transfer to a bowl and cool completely.
Serve: Release cheesecake from pan. Top with cooled salted caramel. Slice and serve.