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. In bagels, this fine texture ensures even sweetness distribution without disrupting dough hydration or gluten structure. The cornstarch also helps absorb minor moisture, maintaining dough integrity.
To replicate this, blend granulated sugar with cornstarch in a food processor until very fine. Ensure the mixture is sifted before adding to the dough to avoid lumps. This substitute allows the dough to maintain its elasticity and rise properly.
Compared to pure powdered sugar, this blend produces nearly identical sweetness and texture in the bagel dough, preserving the classic chewy crumb and crust without introducing moisture or flavor changes.