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How to make it. 1  If your recipe calls for... 2  1 tsp. of baking powder, add instead 1/2 tsp. cream of tartar and 1/4 tsp. baking soda. 3  1 1/2 tsp. of baking powder, add instead 3/4 tsp. cream of tartar and 3/8 tsp. baking soda (1/4 plus 1/8 tsp.). To make a large batch of baking powder, mix Â¼ cup starch (arrowroot or tapioca) with Â¼ cup of baking soda and Â½ cup of cream of tartar. The starch is very important! Otherwise you get concrete. Keep in a sealed jar or Tupperware. 1 tsp. mix equals 1 tsp. baking powder.
On the other hand, it's quite simple to substitute baking powder with your own homemade mixture of baking soda, cornstarch, and cream of tartar (a powdered acid). For every teaspoon of baking powder, use 1/4 teaspoon of baking soda, 1/2 teaspoon of cream of tartar, and 1/4 teaspoon of cornstarch.