All-Purpose Flour (Best Option)
1 cup per 1 cup bread flourAll-purpose flour has a protein content typically between 10-12%, lower than bread flour's 12-14%, which means it forms less gluten. This reduction in gluten development is beneficial in vanilla cake, where excessive gluten can make the crumb tough.
When substituting, use a 1:1 ratio and avoid overmixing to prevent toughening the cake. The batter may be slightly less elastic but will still hold together well.
The final cake will be softer and more tender than if bread flour were used, which is generally preferred in vanilla cakes for a delicate texture.