one 9-inch pie shell

A pie shell is a pre-formed pastry crust designed to line a standard 9-inch (23 cm) pie pan, serving as the structural foundation for both sweet and savory pies. The shell is typically composed of wheat flour, fat (butter, lard, or vegetable shortening), salt, water, and sometimes sugar, combined through techniques that create a flaky or tender crumb structure. Modern pie shells are available in three primary forms: frozen pre-made shells (par-baked or unbaked), refrigerated dough rounds, and homemade dough prepared fresh. The 9-inch measurement is the most common household pie size in North American baking, representing a standard volume of approximately 6–8 cups of filling capacity depending on depth and crust thickness.

The fundamental purpose of a pie shell is to contain and support filling while developing a golden-brown exterior with desirable textural qualities—either crisp and flaky (achieved through lamination techniques) or tender and shortbread-like (from high fat-to-flour ratios). The quality of a pie shell directly impacts the final dessert, influencing moisture retention, structural integrity, and flavor complexity.

Pie shells serve as the edible vessel for both dessert and savory pies across numerous culinary traditions. In American and European baking, they are fundamental to fruit pies (apple, cherry, peach), cream pies (banana, chocolate, coconut), and custard-based fillings (quiche, chess pie). The shell can be blind-baked (pre-baked) to prevent sogginess when filled with wet custards or cream, or left unbaked for fillings that require oven time. Pie shells are also used for savory applications including savory quiches, meat pies, and vegetable tarts in French cuisine. The versatility extends to both single-crust (for open-faced or lattice-topped pies) and double-crust configurations, making the pie shell adaptable across diverse global pie traditions and seasonal baking practices.