Question: what to substitute baking powder with?
Answer: Buttermilk. Buttermilk is a fermented dairy product with a sour, slightly tangy taste that is often compared to plain yogurt. ... 
Plain Yogurt. ... 
Molasses. ... 
Cream of Tartar. ... 
Sour Milk. ... 
Vinegar. ... 
Lemon Juice. ... 
Club Soda.