01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper.
02 - Combine flour, brown sugar, and salt in a bowl. Cut in cold butter with a pastry blender or fork until mixture becomes crumbly. Press firmly into the bottom of the prepared pan.
03 - Bake crust for 10 minutes until lightly set.
04 - Whisk together pumpkin puree, maple syrup, brown sugar, eggs, pumpkin pie spice, vanilla extract, and salt until completely smooth.
05 - Pour the pumpkin mixture evenly over the pre-baked crust and spread with a spatula.
06 - Mix flour, brown sugar, cinnamon, salt, and melted butter until crumbly texture forms.
07 - Sprinkle streusel mixture evenly over the pumpkin filling. Bake for 30 minutes until center is set and topping is golden brown.
08 - Let bars cool completely in the pan. Lift out using parchment paper and cut into 16 squares.