• 2¼ cups graham cracker crumbs (about 17-20 crackers)
• 1 tablespoon firmly packed dark brown sugar

Preheat the oven to 300 degrees F. Butter the sides and bottom of a 9-by-13-inch baking pan or spray it with nonstick cooking spray.

In a large bowl, stir together the graham cracker crumbs and brown sugar. Add the butter. Use your hands to combine the mixture, then turn it out