Preheat your oven to 350 degrees (F). Spray a pie plate with non-stick spray. Set aside.
In a medium bowl mix the graham cracker crumbs, melted butter, salt, and sugar until well combined. The mixture should be the texture of wet sand. Be sure you break up any chunks that might have formed.
Firmly press the graham cracker mixture into the pie plate using the bottom of a cup.
Bake the crust for 8-10 minutes or until golden brown. Remove from oven and allow to cool completely before adding the filling.
For Filling:
In a medium bowl mix with a hand mixer combine the melted butter and brown sugar. When fully combined add the eggs and vanilla. Beat until fully combined and light in color.
In a small bowl combine the flour, cocoa powder, and salt. Whisk to combine and remove any lumps.
Add the dry ingredients to the wet ingredients and mix until just combined. Don’t over mix or you will have a tougher texture to your end product.
Fold the chocolate chips into the mixture and pour into the prepared pie crust.
Bake the pie for 40-45 minutes or until a toothpick inserted into the center of the pie comes out with only a few moist crumbs. Bake the pie for less time if you want the filling to be gooey.
Remove the pie from the oven and allow to cool slightly.
Set the oven to broil. Cover the top of the pie with mini marshmallows. Broil the pie until the marshmallows are toasted to your liking.