โญ Cornstarch (Best Vegan Option)
1:1 (1 tablespoon cornstarch per 1 tablespoon arrowroot powder)Cornstarch works well as a thickening agent and moisture retainer similar to arrowroot powder due to its fine starch granules. It helps stabilize the batter and contributes to a soft, tender crumb in the cake.
When substituting, ensure the cornstarch is well incorporated to avoid clumping. It is best added by sifting with the dry ingredients. Avoid overmixing to maintain cake tenderness.
Compared to arrowroot, cornstarch may produce a slightly less glossy finish but will preserve the moist, delicate texture essential to a Red Velvet Cake.