01 - Preheat the oven to 350°F. Line a 9x13-inch baking pan with parchment paper, leaving an overhang on the sides for easy removal.
02 - Combine graham cracker crumbs, granulated sugar, and ground cinnamon in a medium bowl. Stir in melted butter until mixture is evenly combined. Press crumb mixture firmly and evenly into the bottom of the prepared pan. Bake for 8 minutes. Remove from oven and allow to cool slightly.
03 - In a large bowl, beat softened cream cheese and granulated sugar until smooth. Add eggs one at a time, mixing well after each addition. Blend in vanilla extract, pumpkin puree, ground cinnamon, ground ginger, ground nutmeg, ground cloves, and salt until completely incorporated.
04 - Pour the cheesecake mixture over the slightly cooled crust and smooth the surface with a spatula.
05 - In a medium bowl, whisk together all-purpose flour, light brown sugar, ground cinnamon, and salt. Cut in the cold, cubed butter using a pastry cutter or fork until the mixture forms coarse crumbs. Stir in chopped pecans.
06 - Sprinkle the pecan streusel evenly over the cheesecake layer. Bake for 40 to 45 minutes or until the center is just set and the streusel has turned golden brown.
07 - Cool the bars completely in the pan. Transfer to the refrigerator and chill for at least 3 hours before slicing.
08 - Using the parchment paper overhang, lift the bars from the pan and cut into 16 equal portions. Serve chilled.