Baking Powder (Best Option)
3 teaspoons baking powder per 1 teaspoon baking sodaBaking powder contains both an acid and a base, allowing it to react and produce carbon dioxide gas when moistened and heated, which helps the bagels rise. This mimics the leavening effect of baking soda but with a milder reaction.
To use baking powder successfully in bagels, increase the amount to about three times the baking soda called for, as baking powder is less concentrated. Watch for a slightly different rise and texture, as the reaction is slower and less intense.
The final bagel will be less dense and chewy than with baking soda, with a lighter crumb and slightly different crust texture, but still acceptable for most recipes.