01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, allowing overhang on sides for easy removal.
02 - In a bowl, combine flour, brown sugar, and salt. Cut in cold butter with a pastry blender or fork until mixture resembles coarse crumbs. Press firmly and evenly into the bottom of the prepared pan.
03 - Bake crust for 10 minutes until lightly set. Remove from oven and set aside.
04 - In a separate bowl, whisk together pumpkin puree, maple syrup, brown sugar, eggs, pumpkin pie spice, vanilla extract, and salt until completely smooth and well combined.
05 - Pour the pumpkin filling evenly over the warm pre-baked crust. Use a spatula to spread into a uniform layer.
06 - Combine flour, brown sugar, cinnamon, salt, and melted butter in a bowl. Mix with a fork until crumbly and well blended.
07 - Sprinkle streusel mixture evenly over the pumpkin filling. Bake for 30 minutes until the center is set and the topping is golden brown.
08 - Let bars cool completely in the pan. Use parchment paper overhang to lift out the slab, then cut into 16 equal squares.