Dark Brown Sugar (Best Option)
1:1Dark brown sugar contains a higher molasses content than light brown sugar, which enhances the caramel and toffee notes in bread pudding. The moisture in the molasses helps keep the custard tender and prevents dryness.
When substituting, use an equal amount and ensure it is well incorporated to avoid clumps. Dark brown sugar may slightly deepen the color of the pudding.
The final bread pudding will have a richer, more robust flavor with a moist and tender crumb, closely resembling the original made with light brown sugar.