Break the graham crackers into pieces. Put the pieces into a large ziplock bag and use a rolling pin to crush the crackers into crumbs.
For a finer, sandy consistency use a food processor. Blend the crackers until they are a fine powder or sandy texture.
Add sugar and melted butter. Pour crumbs into a mixing bowl and add sugar to the crumbs, mix until well combined. Pour in melted butter. Stir until well combined.
Optional: add egg white.* Separate egg white of one egg from the yolk and pour the egg white into the graham cracker crust mixture. Mix with a rubber spatula until combined.
Add crust mixture to a pie dish. Pour the crust mixture into a pie dish and press it into the dish. I like to use my hands at first, then use the bottom of a measuring cup or glass to smooth the top. Press up the sides of the pie plate, too.
Bake the crust for about 10 minutes. Let crust cool completely before adding pie filling.
Video
Notes
Egg white helps graham cracker crust to bind together and really stick. Most graham cracker crusts are crumbly and that is how people like it. However, if you want your crust to really stick together and get nice clean slices, egg white is a helpful addition. Using egg white will also result in a slightly chewier texture. If you don't like that, don't use it. Totally optional!