Using Blended Granulated Sugar Instead of Powdered Sugar
Ratio
Blend 1 cup granulated sugar + 1 tbsp cornstarch until powdery
Excellent — nearly identical results
Measurement Variance Note
For 1 cup references, this ingredient can vary by about 8% across brands and measuring methods (110g-130g per cup). For the most reliable substitution result, measure by weight and test a half batch first.
What changes when you swap powdered sugar for blended granulated sugar
Granulated sugar can stand in for powdered, but only after a trip through the blender — the swap is really about particle size, not chemistry. Powdered sugar dissolves on contact because its crystals are ground to roughly 10 microns; granulated sits closer to 500. Drop raw granulated into a buttercream and you get a gritty frosting that never fully smooths out, even after ten minutes of beating. Blend it with a tablespoon of cornstarch first and you mimic commercial 10X almost exactly.
- Use a high-powered blender or spice grinder, not a food processor — standard processor blades leave the sugar sandy, and you'll feel it in royal icing or a glaze.
- Let the blended sugar settle for a minute before opening the lid, then sift before measuring. The volume fluffs up considerably, so weigh it (120g per cup) rather than scooping.
- Skip the cornstarch only if you're using it immediately in a cooked application like an Italian meringue — for raw buttercream, dusting, or fondant, the starch matters for stability and anti-clumping.