1-First Step: Measure the all-purpose flour. Start with 1 cup (120g) of all-purpose flour. Spoon it into your measuring cup and level with a knife for accuracy. Volume measures can vary by packing, so weighing on a kitchen scale gives precision. This base provides the wheat foundation needed for structure.

2-Second Step: Remove 2 tablespoons of flour. Scoop out 2 tablespoons (about 16g) from the measured flour. Discard or save for another use like thickening sauces. This reduction lowers the protein content, preventing tough textures in your final bakes. For larger batches, maintain the ratio: subtract 2 tablespoons per cup.

3-Third Step: Add 2 tablespoons cornstarch. Stir in 2 tablespoons (16g) cornstarch to the remaining flour. Cornstarch absorbs moisture differently, creating the silky feel of true cake or pastry flour. Whisk vigorously by hand or use a fork to break up lumps. This cake flour substitute with cornstarch works best when fully blended.

4-Fourth Step: Sift the mixture. Pass the blend through a fine-mesh sieve 3-4 times into a clean bowl. Sifting aerates the mix, removing clumps and mimicking the ultra-fine grind of commercial flours. Do this over parchment if prepping ahead. Each pass improves tenderness in cakes or flakiness in pastries.

5-Fifth Step: Whisk and rest. After sifting, whisk once more for uniformity. Let the mix sit 5 minutes to settle. Taste a pinch if curious it should feel powdery smooth. Adapt for gluten-free by using certified GF flour from the start.

6-Final Step: Use immediately or store. Incorporate into your recipe right away for peak performance. Replace cup-for-cup in place of cake or pastry flour. In a classic vanilla cake, expect higher rise and velvety crumb. Test in small batches first, like muffins. For pie crusts, chill the dough after mixing.