To make these sheet pan pumpkin pie bars, begin by preheating your oven to 350F.
Next, prepare the crust. In a food processor, add the graham crackers and process until the texture is like sand.
Add the graham cracker crumbs, coconut sugar (if using), and kosher salt in a medium bowl and mix to combine. Set aside.
Then, brown the butter. Place the butter into a small saucepan over medium-low heat and let it melt, swirling the pan as it cooks. Continue cooking until the butter turns golden, smells nutty, and becomes fragrant. This should take about 3 minutes, but watch carefully so it doesn't burn.
Pour the browned butter into the bowl with the graham cracker mixture and mix well. It should look like wet sand.
Transfer the mixture to the sheet and press it down firmly into an even layer. Bake it for 10 minutes.
While the crust is in the oven, prepare the pumpkin filling. Add the pumpkin puree, eggs, coconut condensed milk, and pumpkin pie spice to a large bowl and whisk until smooth.
Pour the filling over the warm crust and return the pan to the oven and bake for 35-37 minutes, until the top looks puffy (it will settle as it cools).
Finally, prepare the pecan topping. Add the chopped pecans, melted butter, and coconut sugar to a small bowl and mix to combine.
Spread the mixture evenly over the pumpkin layer. Let bars cool completely before slicing—you can refrigerate them to help them firm up.
Slice into squares and enjoy!