I mix up 2 kilograms at a time: 500 grams sweet rice flour, 400 grams brown rice flour & potato starch, 200 grams ivory teff & arrowroot starch, 100 grams white rice flour, potato flour, & tapioca starch. The original recipe had almond flour instead of white rice flour, but I decided to make this nut-free (had some friends with nut allergies).

thanks, this is great info! it seems like you have some premixed starch mixes as ingredients?

Nope - those are all bagged single ingredients I usually order online. Authentic Foods has most of them. The ivory teff is from Maskal. The arrowroot and tapioca might be called flour, starch, or powder - all the same thing. Potato starch and potato flour are 2 different things.

oh, so for example it's 100 grams white rice flour, 100 grams potato flour, and 100 grams tapioca starch, not 100 grams of a mix of the three? i guess that makes it add up to 2 kg

Yep, that's what I meant.

thanks! should have been obvious, but to me it wasn't