Arrowroot Powder (Best Option)
1:1 (use equal amount as cornstarch)Arrowroot powder is a starch extracted from tropical plants and acts as a neutral thickener and tenderizer, similar to cornstarch. It helps inhibit gluten formation by coating flour proteins, resulting in a soft, tender sugar cookie.
To use arrowroot powder successfully, measure it exactly as you would cornstarch. It dissolves well and does not require pre-cooking, making it easy to incorporate into cookie dough. Avoid overheating as it can break down under prolonged heat.
Compared to cornstarch, arrowroot yields a similarly tender and slightly lighter texture, preserving the cookie’s delicate crumb and preventing excessive spreading.