⭐ Caster Sugar with Cornstarch (Best Nut-Free Option)
1 tablespoon caster sugar + 1 teaspoon cornstarch per 1 tablespoon powdered sugarCaster sugar is finer than granulated sugar, allowing it to dissolve more readily in the mousse. Adding cornstarch prevents clumping and mimics the anti-caking property of powdered sugar, ensuring a smooth texture.
For best results, sift the caster sugar and cornstarch together before folding into the mousse to avoid any gritty spots. This mixture dissolves quickly in the fat and liquid components of the mousse.
Compared to powdered sugar, this substitute maintains the mousse’s light and airy texture without compromising sweetness or mouthfeel.