Line a 8x8 baking dish with foil or parchment paper, make sure to leave some overhang so you can pull the bars out of the baking dish.
Spray the foil or parchment paper with non stick spray.
Make the crust:
To a medium sized bowl or stand mixer beat together the butter and brown sugar, now add in the flour and salt beat until well combined. It will be crumbly.
Press this mixture into the bottom of the baking dish.
Bake for 10 minutes.
Make the pumpkin pie filling:
To a medium sized bowl add in all of the pumpkin pie filling ingredients. Beat until well combined and smooth.
Once the crust is out of the oven add this filling into the baking dish.
Bake for 60 minutes or until the center is slightly jiggly but the edges are set.