<<Disclaimer: Verify this information before applying it to your situation.>> Thank you all who replied to my query about a replacement baking powder. There have been so many of you replying with good advise, it is getting to be difficult to thank each one individually. It appears that I can use the following mixture until I can obtain a supply of corn and gluten free baking powder. So now I will be able to have a birthday cake...and more! 1 Tbs. potassium bicarbonate or sodium bicarbonate (baking soda) 2 Tbs. cream of tartar 2 Tbs. starch-arrowroot, tapioca or potato Thank you Andrew Shaw [log in to unmask]