prepared 9-inch graham cracker crust or pastry pie shell<ref>*[http://www.worldwideschool.org/library/books/tech/recipes/dessertsi~p/key-lime-pie/chap1.html traditional key lime pie recipe]</ref>

A graham cracker pie crust is a pre-assembled or homemade pastry shell composed of crushed graham crackers (sweetened whole-grain crackers), butter, and sugar, pressed into a 9-inch pie dish and typically baked until firm. Graham crackers, developed in the United States in the 1880s as a health food based on Rev. Sylvester Graham's dietary principles, are made from graham flour (whole wheat flour) and contain a distinctive slightly sweet, nutty flavor with subtle honey notes. The crust serves as a ready-made foundation for both chilled and baked desserts, offering convenience and structural integrity. Store-bought versions come fully prepared and chilled, while homemade versions allow for customization of sweetness and butter content. The texture is crisp and crumbly, providing textural contrast to creamy or custard fillings.

Graham cracker crusts are essential foundations for cream pies, chiffon pies, and no-bake desserts across American cuisine. Key lime pie, the most iconic application, pairs the tangy filling with the sweet crust. The crust also appears in cheesecake, chocolate cream pies, banana cream pies, and icebox desserts. For baked fillings, the crust may be pre-baked to prevent sogginess; for chilled fillings, it can be used raw or briefly chilled. The sweetness of the crust complements both tart and rich fillings, making it versatile for desserts ranging from fruit-based to chocolate and custard preparations. The crust should be pressed firmly into the dish to ensure structural stability and may benefit from a thin egg wash or melted butter seal to prevent filling seepage.