Granulated Sugar and Cornstarch Blend (Best Option)
1 cup granulated sugar + 1 tablespoon cornstarch = 1 cup powdered sugarPowdered sugar is essentially granulated sugar ground to a fine powder with a small amount of cornstarch to prevent clumping. By blending granulated sugar with cornstarch, you recreate the fine texture and anti-caking properties that help distribute sweetness evenly in scone dough without affecting moisture content.
For best results, pulse the mixture until it reaches a powdery consistency, then sift before adding to the dough to avoid lumps. This substitute ensures the sugar integrates smoothly, preserving the scone's tender crumb.
Compared to store-bought powdered sugar, this homemade blend performs nearly identically, maintaining the scone's light texture and balanced sweetness.