Gluten-Free Flaky Biscuits

Preheat the oven to 400° F.
Grease a cookie sheet.
In a mixing bowl, stir together the brown rice flour, potato starch, salt, and baking soda.
Cut in the butter until the mixture resembles course crumbs.
In a seperate bowl, whisk the eggs with the egg whites and apple cider vinegar.
Stir the wet ingredients into the dry.
Pat out 3/4" thick on a surface floured with brown rice flour.
Cut into biscuits and transfer to prepared baking sheet.
Bake for about 15 minutes.