Granulated Sugar and Cornstarch Blend (Best Option)
1 cup powdered sugar = 1 cup granulated sugar + 1 tablespoon cornstarchGranulated sugar provides the sweetness, but its larger crystals can affect texture. Adding cornstarch reduces clumping and simulates the powdery consistency of powdered sugar, which is important for even mixing and smooth dough.
For best results, pulse granulated sugar with cornstarch in a food processor until very fine and powdery before measuring. Watch for slight changes in dough handling as it may be less immediately smooth.
The final cookies will be very close in texture and sweetness to those made with powdered sugar, with a slightly less melt-in-the-mouth feel but no significant compromise in quality.