So after reading up on Cookie Run lore, Beast-Yeast is a continent on the world of Earthbread, so that's fine, I guess? Yet none but Kouign-Amann Cookie actually requires yeast.
However, I completely forgot about arab cuisine, which has a variety of yeast-based biscuitry, most notably Kleicha, Kaak bi Halib, Ma'amoul and Makrouta. Damn this gay pastry making me hungry.