First, break up the graham crackers in the food processor until coarse crumbs. Put them in a bowl and mix in the brown sugar.
Next, add the melted butter and stir it all together until everything is coated.
Preheat the oven to 325 degrees.
Line a baking sheet with parchment paper. Spread the graham cracker mix evenly on the sheet. Bake it in an oven for 10 minutes. Let it cool for at least 10 minutes before you use it. Enjoy!