Granulated Sugar and Cornstarch Blend (Best Option)
1 cup granulated sugar + 1 tablespoon cornstarch, powdered in a blender to yield 1 cup powdered sugar substitutePowdered sugar is essentially granulated sugar ground very finely with a small amount of cornstarch to prevent caking. By blending granulated sugar with cornstarch, you replicate the fine particle size and anti-caking properties, which allows the sugar to dissolve quickly on the French toast surface, providing even sweetness.
For best results, pulse the granulated sugar and cornstarch in a high-speed blender until it reaches a powdery consistency. Store in an airtight container to maintain texture. Use immediately for optimal smoothness.
This substitute closely mimics the original powdered sugarβs texture and sweetness, preserving the classic light dusting and mouthfeel expected in French toast toppings.