โญ Cornstarch (Best Nut-Free Option)
1:1 (replace arrowroot powder by volume)Cornstarch works well as a substitute because it is a fine starch that thickens and stabilizes batters similarly to arrowroot powder. Both starches gelatinize at similar temperatures, helping to retain moisture and improve crumb structure.
For best results, sift cornstarch before mixing to avoid lumps and ensure even incorporation. Avoid overmixing the batter to maintain a tender crumb.
Compared to arrowroot, cornstarch may produce a slightly less glossy finish but will not noticeably affect flavor or texture, making it an excellent alternative in vanilla cake.