- Preheat oven to 350 degrees. Line bottom and sides of an 8-inch square baking pan with parchment paper or aluminum foil, leaving an overhang on all sides. Set aside. 
- In a food processor, blend cookies until finely ground, add butter, and pulse until moistened. 
- Transfer crumb mixture to prepared pan, and press gently into bottom. Bake until fragrant and slightly firm, 12 to 15 minutes. Set aside to cool. 
- Place cream cheese in food processor; blend until smooth. Add sugar, pumpkin puree, eggs, flour, pumpkin-pie spice, and salt; process until combined. Set aside. 
- Place chocolate in a microwave-safe bowl; microwave in 30-second increments, stirring between each, until melted. Add 1 cup pumpkin mixture; stir to combine. Set aside. 
- Pour remaining pumpkin mixture into prepared pan. Drop dollops of chocolate mixture onto pumpkin mixture; swirl. Bake until cheesecake is set but jiggles slightly when gently shaken, 40 to 50 minutes. 
- Cool in pan. Cover; chill until firm, at least 2 hours (and up to 2 days). Using overhang, transfer cake to work surface. With a knife dipped in water, cut into 16 squares. Serve.