According to Food Network, mashed banana is a handy substitute for eggs when used in baked goods like waffles, quick breads and muffins — aka, the ones that don’t rely on eggs for leavening.

Source: https://thewatchdogonline.com/thrifty-baking-cheapest-egg-substitutes-amid-soaring-prices-35047

Sourdough Fermentation Some traditional breads, such as Persian Barbari, use natural sourdough fermentation for leavening, resulting in a tangy flavor.

Source: https://www.greenprophet.com/2023/12/a-journey-into-middle-eastern-bread-traditions/

We must not settle into complacency and forget our task of being a changing agent and a leavening force in the world.

Source: https://catholicoutlook.org/bishop-vincents-homily-for-the-first-weekend-of-advent/