All-Purpose Flour with Cornstarch (Best Option)
For every 1 cup cake flour, use 1 cup all-purpose flour minus 2 tablespoons, plus 2 tablespoons cornstarchCake flour has a lower protein content (7-8%) compared to all-purpose flour (10-12%), which affects gluten formation and results in a softer crumb. Adding cornstarch dilutes the protein in all-purpose flour, mimicking cake flour’s properties by limiting gluten development.
To ensure success, sift the all-purpose flour and cornstarch together to evenly distribute the cornstarch. Avoid overmixing the dough to prevent toughness.
Cookies made with this substitute will be slightly less delicate than those made with pure cake flour but will maintain a tender, soft texture and light crumb ideal for sugar cookies.