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 is low in protein, which limits gluten development and keeps baked goods tender. Cornstarch dilutes the protein in all-purpose flour, lowering its effective gluten content and replicating cake flour’s properties. This is important in Crème Brûlée to maintain a silky, tender custard without toughness.
When mixing, sift the all-purpose flour and cornstarch together to ensure even distribution. Avoid overmixing the custard base to prevent gluten formation. This substitute works best when carefully measured and incorporated.
Compared to original cake flour, this substitute produces a nearly identical texture in the custard, maintaining the delicate mouthfeel and preventing firmness or graininess.