Hi Gwen, although we do recommend using the type of leavening agent called for in the recipe, here are some possible substitutions for baking powder mentioned in this blog post: 

Substitutions for baking powder

Make your own: Remember, baking powder is a mixture of baking soda and cream of tartar — which means you can easily make it yourself.

• Sub for 1 teaspoon baking powder: Combine 1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar + 1/4 teaspoon cornstarch or tapioca starch.

Baker’s ammonia: Baker’s ammonia is a trusty leavener from the 19th century that produces a light, tender crumb similar to what you’d get from baking powder. You can use it 1:1 in place of baking powder. Be aware: It doesn't smell great, but no need to worry, as the smell totally dissipates by the time baked goods are done. 

• Sub for 1 teaspoon baking powder: 1 teaspoon baker’s ammonia

Lemon juice or vinegar: These acids react with baking soda to mimic the power of baking powder.

• Sub for 1 teaspoon baking powder: 1/4 teaspoon baking soda + 1/2 teaspoon lemon juice or white vinegar  

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