Heat the oven to 375 degrees.

Combine graham cracker crumbs and sugar in a medium bowl and stir to mix them well.

Add the butter and stir to mix it evenly into the crumbs mixture.

Press the buttery crumbs into a 9-inch pie pan,

distributing the mixture evenly, and pressing firmly with your hands or another pie pan of the same size, to flatten the crumbs and shape a sturdy crust to hold the filling. Make sure to work the crumbs up to the rim of the pan, to make a good, strong edge.

Place the crust on the center shelf of the oven. Bake at until the crust is heated through and lightly browned, 8 to 10 minutes. Place the crust on a cooling rack and let it cool to room temperature before adding the filling. NOTE: You can purchase graham cracker crumbs in the baking section of the grocery store.

If you purchase graham crackers, you can make crumbs using a food processor. Just break the graham crackers into medium pieces, and put them into the work bowl of a food processor. Pulse to break pieces down into bits. Process until you have fine crumbs, stopping once or twice to scrape the sides and grind them evenly. Measure out 1 1/4 cups, and prepare the crust as directed.