All-Purpose Flour with Cornstarch (Best Option)
1 cup all-purpose flour minus 2 tablespoons, plus 2 tablespoons cornstarchCake flour is low in protein (about 7-8%) which results in less gluten formation and a tender texture. By replacing 2 tablespoons of all-purpose flour with cornstarch, the protein content is effectively lowered, mimicking cake flour’s softness. This balance is critical in quiche to avoid a tough crust and ensure a delicate custard.
For best results, sift the all-purpose flour and cornstarch together to ensure even distribution. Avoid overmixing the dough to prevent gluten development. Monitor baking time closely as texture may slightly differ.
The final quiche will have a tender, flaky crust and a smooth, custardy filling very close to the original recipe using cake flour, with minimal textural differences.