Corn free baking powder
1 tsp. of baking powder, add instead 1/2 tsp. cream of tartar and 1/4 tsp. baking soda.
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 ¼ cup starch (arrowroot or tapioca) with ¼ cup of baking soda and ½ cup of cream of tartar. The starch is very important! Otherwise you get concrete when it sits between uses. Keep in a sealed jar or Tupperware. 1 tsp. mix equals 1 tsp. baking powder.
Carrie Meszaros ND