It is not essential whether the bread be leavened or unleavened.
en.wikipedia.org In addition to flour, doughnuts may also include such ingredients as water, leavening, eggs, milk, sugar, oil/shortening, natural flavors and/or artificial flavors.
en.wikipedia.org Ingredients include flour, sugar, salt, ripe banana, pineapple, cinnamon, pecans, vanilla, eggs, and leavening agent.
en.wikipedia.org Many flatbreads are unleavened made without yeast although some are slightly leavened, such as pita bread.
en.wikipedia.org Some flatbreads, such as naan, use leavening agents; others, such as matzo, do not.
en.wikipedia.org