All-Purpose Flour with Vital Wheat Gluten (Best Option)
For every 1 cup bread flour, use 1 cup all-purpose flour plus 1 tablespoon vital wheat glutenBread flour typically contains 12-14% protein, which is crucial for gluten development and the elasticity needed for yeast bread to rise properly. All-purpose flour has lower protein (about 10-11%), so adding vital wheat gluten (pure gluten protein) raises the protein content to approximate bread flour.
To use this substitute effectively, mix the vital wheat gluten thoroughly with the all-purpose flour before adding liquid ingredients. Watch hydration levels as vital wheat gluten can absorb more water, so slight adjustments may be necessary.
The final bread will have a texture and crumb very close to that made with bread flour, with good chewiness, volume, and structure, making it the best single substitute.