All-Purpose Flour (Best Option)
1 cup all-purpose flour per 1 cup cake flourAll-purpose flour contains more protein than cake flour, which can result in a slightly firmer coating on roasted vegetables. The gluten content helps create a light crust when vegetables are tossed and roasted, mimicking the effect of cake flour's fine texture.
To achieve a closer match, you can sift the all-purpose flour before use to aerate it and reduce density. Watch for slightly more browning due to higher protein content.
The final result will have a marginally firmer texture but will still provide a pleasant coating that enhances caramelization and mouthfeel compared to no flour.