When you don’t have buttermilk, you can easily make it at home. You’ll need to add a tablespoon of vinegar or lemon juice to a cup of milk and allow it to sit and settle for roughly 30 minutes. Give it one good mix with a spoon before measuring it out and adding it to your recipe.

Combine 1/4 teaspoon baking soda with a 1/2 cup of buttermilk to substitute a teaspoon of baking powder (reduce the liquid in your recipe 1/2 cup).

Combine 1/2 teaspoon of vinegar with 1/4 teaspoon of baking soda to equal 1 teaspoon of baking powder. Make sure you’re combining these two ingredients before adding them to any batter that you’ve prepared. You want to mix them to create a component that will act like baking powder.

Combine 1/2 a teaspoon of the lemon juice and 1/4 teaspoon of the baking soda to quickly create an alternative equivalent to a teaspoon of baking powder. 

Mix 1/2 cup of yogurt with 1/4 teaspoon baking soda to replace a teaspoon of baking powder (reduce the liquid in the recipe by 1/2 cup). It shouldn’t take more than a few seconds for you to mix these ingredients, and then carefully add them to your recipe to get the same results that you’d get from using traditional baking powder.

Most people don’t realize this, but club soda contains sodium bicarbonate. Sodium bicarbonate is baking soda, meaning that if you have club soda at home, you can conveniently use it to replace baking powder in recipes. You can add 1/4 teaspoon of baking soda to the club soda, but it’s not a requirement. 

I use one part baking soda and two parts cream of tartar. In other words, combine 1 teaspoon baking soda and two teaspoons cream of tartar and you will have 3 teaspoons of baking powder.