Brown Sugar (Best Option)
1:1 by volumeBrown sugar works well because it contains molasses, which adds moisture and a richer flavor profile that complements zucchini bread's spices and vegetable content. The granulated sugar's crystalline structure is replaced by the softer crystals of brown sugar, which retain moisture.
To ensure success, pack the brown sugar lightly to avoid over-sweetening and monitor baking time as the additional moisture can slightly extend it. The bread may brown a bit faster due to molasses content.
Compared to granulated sugar, brown sugar produces a moister, more tender crumb with a deeper flavor, enhancing the overall eating experience without compromising structure.