Cornstarch (Best Option)
1:1 (1 tablespoon cornstarch per 1 tablespoon arrowroot powder)Cornstarch works well as a substitute because it has comparable thickening properties and helps create a light, crispy texture by absorbing moisture and forming a delicate crust during cooking.
To ensure success, mix cornstarch thoroughly with the dry ingredients to avoid clumping. Be mindful that cornstarch can break down if overcooked, so cook waffles until just golden.
Compared to arrowroot, cornstarch may produce a slightly less glossy finish but maintains the desired crispness and tenderness in waffles.