Preheat oven to 350°F (175°C) and line a 9x13-inch baking pan with parchment paper.
In a mixing bowl, combine Biscoff cookie crumbs, brown sugar, and melted butter. Press into the bottom of the prepared pan and bake for 10 minutes.
Reduce oven temperature to 300°F (148°C). In a large bowl, beat cream cheese until smooth, then gradually add granulated sugar and brown sugar.
Add sour cream, then mix in eggs one at a time, followed by vanilla extract, pumpkin puree, pumpkin pie spice, cinnamon, and nutmeg.
Pour about 2/3 of the vanilla cheesecake batter over the cooled crust, then pour the pumpkin batter on top. Dollop the remaining vanilla batter and swirl together.
Place the baking pan in a larger pan filled with hot water (water bath) and bake for 55-65 minutes until edges are set and center is slightly jiggly.
Cool in the oven with the door closed for 1 hour, then chill in the fridge for at least 6 hours or overnight.
Whip heavy cream with powdered sugar until stiff peaks form, then fold into softened cream cheese. Spread over the chilled cheesecake bars.
Drizzle with Biscoff cookie butter and sprinkle additional cookie crumbs before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 5 days or freeze for up to 2 months.