in a small bowl, whisk together sugar, salt and 2 teaspoons pumpkin spice. Set aside.
In a large bowl, beat the eggs.
Add pumpkin puree, evaporated milk, vanilla and prepared sugar mixture.
Beat until blended. Set aside.
Line an 8x8" pan with parchment paper and set aside.
Preheat oven to 375.
In a medium bowl, whisk together brown sugar, flour, brown sugar, baking soda, baking powder, salt and pumpkin pie spice.
Add melted butter and mix until combined and crumbles form.
Remove 3/4 cup of this crust mixture to save for topping and set aside.
Transfer remainder of crust mixture to prepared pan and press into bottom.
Pour prepared filling mixture over crust.
Bake for 20 minutes
Remove from oven and sprinkle with the topping mixture.
Bake for 10-15 minutes, until the topping is golden brown.
Cool completely before cutting.