Baking Powder (Best Option)
3 teaspoons baking powder per 1 teaspoon baking sodaBaking powder contains both an acid and a base, allowing it to produce carbon dioxide gas when moistened and heated, similar to baking soda but without needing an external acid. In bread pudding, this ensures the custard-soaked bread rises gently, creating a light, airy texture.
To use baking powder effectively, increase the quantity to about three times the amount of baking soda called for, since baking powder is less potent. Monitor the batter to avoid overmixing, which can reduce leavening.
Compared to baking soda, baking powder provides a more balanced rise and slightly less alkaline environment, resulting in a milder flavor and a soft, custardy texture that is ideal for bread pudding.