Granulated Sugar and Cornstarch Blend (Best Option)
1 cup granulated sugar + 1 tablespoon cornstarch, processed to a fine powder to replace 1 cup powdered sugarPowdered sugar is essentially granulated sugar ground to a fine powder with a small amount of anti-caking agent, usually cornstarch. By blending granulated sugar with cornstarch and pulverizing it, you achieve a similar particle size and moisture absorption, which is critical for the texture of zucchini bread. The fine powder dissolves quickly, ensuring even sweetness and preventing graininess.
To succeed, use a high-speed blender or food processor to achieve a powdery consistency. Sift the mixture before adding to the batter to avoid lumps. This method works best when the recipe calls for powdered sugar primarily for sweetness and texture rather than for frosting or glazing.
Compared to original powdered sugar, this substitute maintains the bread’s tender crumb and subtle sweetness without altering moisture content, making it the closest match in both function and flavor.