All-Purpose Flour (Best Option)
1 cup per 1 cup bread flourAll-purpose flour has a moderate protein content (around 10-12%) which is sufficient to develop enough gluten for structure but not so much as to make the crust tough. This balance is perfect for quiche, where a tender yet sturdy crust is desired.
When substituting, handle the dough gently to avoid over-developing gluten, which can make the crust tough. Chill the dough well before rolling to maintain flakiness.
The final crust will be slightly less chewy than with bread flour but will maintain excellent flakiness and structural integrity to hold the custard filling without becoming soggy.