Granulated Sugar and Cornstarch Blend (Best Option)
1 cup granulated sugar + 1 tablespoon cornstarch, processed to a fine powder to replace 1 cup powdered sugarGranulated sugar ground with cornstarch replicates the fine texture and anti-caking properties of powdered sugar. Cornstarch prevents clumping and absorbs moisture, which is critical for maintaining a smooth coating on doughnuts.
For best results, blend the mixture in a high-speed blender or food processor until very fine. Sift before use to ensure uniform powder. Store in an airtight container to prevent moisture absorption.
This substitute maintains the sweetness and texture close to original powdered sugar, providing a visually appealing and pleasant mouthfeel on doughnuts.