The flakiness of a pie crust is most significantly affected by what factor?

The flakiness of a pie crust is most significantly affected by the type of fat used. Different fats contribute differently to the texture of the crust because of their distinct properties. For instance, butter contains water and milk solids, which can create steam during baking, helping to achieve a flaky texture. Lard, on the other hand, has a higher fat content and can create a more tender and flaky crust due to the way it interacts with flour.

While the temperature of the fat, oxidation, and oven temperature do influence the overall quality of a pie crust, the choice of fat is the primary factor determining how flaky the final product will be. The type of fat affects not only the flakiness but also the flavor and tenderness of the crust. Therefore, selecting the appropriate fat is crucial for achieving the desired texture in a pie crust.