Preheat the oven to 350°F. Grease a 9” pie plate and set aside.
In a mixing bowl, combine graham crackers and brown sugar. Pour in the melted butter and stir until well combined and the mixture resembles coarse sand.
Press the graham cracker mixture firmly into the prepared pan, bring it up the sides, like a pie crust.
Bake for 10 minutes. Remove from the oven let cool completely.
Place the chocolate chips in a heat-proof bowl. In a saucepan, heat the heavy cream until steaming. Pour the heavy cream over the chocolate chips. Stir until melted and smooth.
Pour the chocolate mixture into the cooled pie crust. If it’s still hot, let it cool to the touch, then cover with plastic wrap and chill in the refrigerator overnight.
Preheat the oven to 350°F. Remove the pie from the fridge.
Top the pie with a scattering of mini marshmallows, graham crackers, and pieces of chocolate bar or chocolate chips. Bake it for 5-7 minutes, until the marshmallows are lightly toasted.
This can be served right away for a more gooey experience, or let it cool and slice it for a more “pie-like” experience.
Notes
You can make this faster by using a store-bought graham cracker crust instead of making your own.