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 rich flavor. By mixing white sugar with molasses, you recreate these properties, ensuring the cupcakes retain their tender crumb and characteristic caramel notes.
For best results, thoroughly mix the molasses into the white sugar before adding to the batter to avoid clumps and ensure even distribution. Adjust slightly if you prefer a lighter or darker flavor.
Cupcakes made with this substitute will have nearly identical texture and flavor to those made with brown sugar, preserving moisture and softness without altering rise or crumb.