Baking Soda and Cream of Tartar (Best Option)
1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar per 3/4 teaspoon baking powderThis substitute works because baking powder is essentially a combination of an acid (often cream of tartar) and a base (baking soda). When combined, they react to produce carbon dioxide gas, which leavens the dough. Using cream of tartar with baking soda mimics this reaction precisely.
For best results, mix the baking soda and cream of tartar thoroughly before adding to the dough to ensure even leavening. Avoid adding extra acidic ingredients to prevent over-acidification, which can affect flavor.
The final cinnamon rolls will have a rise and crumb structure very close to those made with baking powder, preserving the expected soft and tender texture without noticeable flavor changes.