⭐ Granulated Sugar and Cornstarch Blend (Best Dairy-Free Option)
1 cup granulated sugar + 1 tablespoon cornstarch = 1 cup powdered sugarThis blend works because cornstarch prevents clumping and mimics the anti-caking agent in powdered sugar, while finely ground granulated sugar provides the sweetness and texture needed for muffins. The fine powder dissolves quickly, ensuring even sweetness and proper crumb structure.
For best results, pulse the mixture in a high-speed blender until very fine. Avoid over-blending to prevent heat buildup which could melt the sugar. Use immediately or store in an airtight container.
Compared to pure powdered sugar, this substitute maintains the muffin's light texture and sweetness without adding moisture or altering flavor, making it the closest match in baking performance.