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Egg Substitutes in Baking: Six Ratios and Their Limits
A large egg weighs about 50 g out of the shell — that is the unit every substitute below is measured against. What the egg was doing in the recipe decides which swap survives.
What 50 g of egg actually does
An egg is three tools in one shell: a binder (its proteins set in the oven), a moisturizer (it is mostly water) and a leavener (whipped whites trap air). Every substitute covers at most two of the three jobs — this site's substitution table marks all of them for baking, because that is where the missing third job shows up in the crumb.
The fruit swaps: applesauce and banana
Both replace one egg with 50 g of purée — the same weight, no arithmetic needed.
- Applesauce, 50 g per egg — binds and moistens; kitchen-tested in cakes and muffins, but brings no lift at all
- Mashed banana, 50 g per egg — same job, but the banana flavor announces itself; keep it for spiced or chocolate bakes
The gel swaps: flax and chia eggs
Ground seeds soaked in water form a gel that imitates the grip of egg white.
- Flax egg: 1 tablespoon ground flaxseed + 3 tablespoons water, rested 5 minutes — the strongest binder of the six, with a faint nutty note; not for meringues
- Chia egg: same ratio, rested 10 minutes — the same trick, but the seeds stay visible as dark specks
Yogurt and aquafaba: the specialists
Yogurt replaces an egg at 60 g per egg — factor 1.2 — for a moist crumb in muffins and cakes; it is a reference ratio rather than a tested one, so expect a slightly denser result. Aquafaba is the outlier: 3 tablespoons of chickpea brine whip into a stable foam — the only substitute that survives a meringue or a mousse, and it is kitchen-tested.
Where substituting is the wrong tool
Every ratio above is flagged « baking » in the data — and even in baking, structure-first recipes resist the swap. Custards, flans and curds are egg as architecture, not as binder; soufflés need the whites' foam and the yolks' richness at once; buttercreams rely on the yolk's emulsifiers. One egg swapped in a muffin is invisible; three eggs swapped in a custard make a different dessert.
Choosing among the six in ten seconds
Moisture first: applesauce or yogurt. Binding: flax. Whipping: aquafaba and nothing else. Flavor-tolerant batters: banana. And remember the ceiling — these swaps cover one or two eggs in forgiving bakes, not the four-egg sponge where the egg is the recipe.