Preheat the oven to 350°F (180°C) if you're baking the crust. You can opt for simply chilling it until firm.
Have ready a 9-inch pie plate or pie pan with a removable bottom and high sides.
For the cookie crumbs, the easiest way is to use a food processor and process until you have fine crumbs. Make sure there are no large pieces or that it's a very coarse crumb mixture as it will prevent the mixture from compressing well.
By hand: mix 1 ½ cups graham cracker crumbs with 2 tablespoons brown sugar in a medium bowl. Add ½ cup unsalted butter, melted, and combine everything until it resembles wet sand and no dry spots remain.
Food processor: you can make the mixture directly in the bowl of the processor. Simply process 1 ½ cups graham cracker crumbs with 2 tablespoons brown sugar and add ½ cup unsalted butter, melted, to the bowl of the processor, pulse a few times, and you have your graham mixture ready.
Press the mixture onto the pan, starting at the edges and the angles where the base and sides join together and make sure it's compacted. This will help when removing the pie from the pan.
Bake for 10 minutes, until lightly golden and dry. Let cool completely on a wire rack before filling.