01 -
Heat the oven to 325°F (165°C). Line an 8-inch square metal pan with parchment paper, leaving overhang on two sides, and lightly grease the exposed sides.
02 -
Mix the cookie crumbs, melted butter, and salt until evenly moistened. Press firmly into the pan and bake for 8 minutes, then cool while you make the filling.
03 -
Beat the softened cream cheese on medium-low until smooth. Add sugar, 1/3 cup cookie butter, sour cream, and vanilla, then mix until blended. Add the eggs one at a time on low speed, mixing only until combined.
04 -
Spread the cheesecake filling over the crust. Spoon the warmed 1/2 cup cookie butter over the top and drag a knife through it in wide swirls.
05 -
Bake for 32-38 minutes, with a pan of hot water on the lower oven rack if desired, until the edges are set and the center still has a slight wobble.
06 -
Cool completely on a wire rack, then cover and refrigerate for at least 4 hours or overnight before slicing.
07 -
Lift the chilled slab from the pan. Cut into 16 squares with a warm, dry knife, wiping the blade between cuts. Top with crushed cookies and flaky salt if using.