White Sugar + Molasses (Best Option)
1 cup white sugar + 1 tablespoon molasses per 1 cup brown sugarBrown sugar is essentially white sugar with molasses added back in, which provides moisture, acidity, and a complex caramel flavor. Combining white sugar with molasses recreates these properties, ensuring the banana bread retains its characteristic moist crumb and rich taste.
For best results, mix the molasses thoroughly into the white sugar before adding to the batter to ensure even distribution. Adjust slightly if the molasses is very dark or strong in flavor.
This substitute yields a banana bread very close in texture and flavor to the original recipe, preserving moisture and the subtle tang that brown sugar contributes, making it the most reliable alternative.