⭐ Potato Starch (Best Gluten-Free Option)
1:1 (replace cornstarch by volume)Potato starch is a fine, white starch extracted from potatoes that gelatinizes at a similar temperature to cornstarch, allowing it to create a light, crisp crust on fried doughnuts. It also helps retain moisture, preventing dryness in the crumb.
When using potato starch, ensure it is fresh and not exposed to moisture before frying, as it can clump. Mix it thoroughly with the dry ingredients for even distribution.
Compared to cornstarch, potato starch produces a slightly more tender crumb and a crisp exterior that holds up well during frying, making it the closest functional equivalent.