Caster Sugar (Best Option)
1 cup caster sugar per 1 cup granulated sugarCaster sugar works well because its fine granules dissolve quickly into the batter, ensuring even sweetness and smooth texture without changing moisture content. This is crucial in vanilla cake where texture and crumb are key.
To use caster sugar successfully, simply substitute it 1:1 and mix thoroughly to avoid graininess. It is especially beneficial in recipes requiring creaming butter and sugar for aeration.
The final cake will have a tender crumb and proper rise similar to using granulated sugar, with potentially improved mouthfeel due to the finer sugar particles.