1 Part Arrowroot
1 part Baking soda
1 Part cream of tartar

Mix it up like crazy and walllah you've got it. Exchanges exactly as other baking powder in recipes

I get arrowroot and the Baking soda in the health food stores, Bob's Red Mill is who I like, the cream of tartar I do tolerate although I cannot have any grapes! I do always get it in the natural food stores too, no fillers.

Sometimes it can get lumpy just shake it up and you are good to go again. Really works great, in fact I forgot to put it in my muffins this weekend and they look terrible! I think I will line the driveway with them.