Plant-Based Egg Substitutes: From Aquafaba to Flax-Eggs

Aquafaba — the liquid drained from a tin of cooked chickpeas — is one of the most remarkable discoveries in plant-based cooking of recent decades. Accidentally discovered by French tenor and food writer Joël Roessel in 2014 and subsequently popularised by software engineer Goose Wohlt who first demonstrated its whipping properties, aquafaba can be whipped to stiff, glossy peaks that closely resemble whipped egg whites, both in appearance and in culinary function. The mechanism involves a combination of proteins, saponins, and starches leached from chickpeas during cooking that mimic the protein structure of egg white albumin. Three tablespoons of aquafaba replaces one whole egg; two tablespoons replace one egg white. Aquafaba performs best in applications that rely on egg white's aerating and binding functions: meringues, pavlova, macarons, mousse, marshmallows, cocktail foam (replacing the egg white in sours), and mayonnaise emulsification. Its performance in meringue is particularly impressive — aquafaba meringue achieves stiff peaks, holds its shape when piped, and bakes to a crisp exterior with a chewy interior. Adding cream of tartar (approximately ¼ teaspoon per 120ml aquafaba) stabilises the foam and extends whipping time, exactly as with egg whites. Liquid from other legumes — butter beans, navy beans — also works, though chickpea liquid is most consistent due to its protein and starch concentration.

Flax eggs and chia eggs are among the most widely used and reliable egg substitutes for baking applications where binding and moisture retention are the primary functions of eggs — and both flaxseed and hemp seeds add omega-3 fatty acids as a nutritional bonus. A flax egg is made by combining one tablespoon of ground flaxseed (not whole flaxseeds) with three tablespoons of water and leaving for 5–10 minutes until a thick, gelatinous mixture forms. The mucilaginous gel is formed by the soluble fibre (primarily arabinogalactans) in flaxseed absorbing water and creating a viscous matrix. A chia egg follows the same ratio (1 tablespoon chia seeds to 3 tablespoons water) and produces a similar gel through chia's exceptional water-absorbing pectin. Both substitutes bind ingredients effectively and contribute moisture, making them excellent replacements in cookies, muffins, quick breads, brownies, energy balls, veggie burgers, and meatball-style dishes. Flax eggs add a subtle earthy, nutty flavour that is generally complementary in baked goods; golden flaxseed produces a milder flavour than brown. Chia eggs are more neutral in flavour. Neither substitute provides meaningful leavening or the protein-set structure that eggs contribute to items like quiche, frittata, or choux pastry. For recipes that rely heavily on egg's structural contribution, a combination of a gel-based substitute with a leavening agent (bicarbonate of soda with vinegar) produces better results than either alone.

Commercial egg replacers — powdered products like JUST Egg (liquid), Bob's Red Mill Egg Replacer, Orgran No Egg, and Namaste Egg Replacer — are formulated blends of starches, leavening agents, and sometimes plant proteins designed to replicate egg functions in baking. Their composition varies significantly between brands, but most contain some combination of tapioca starch, potato starch, raising agents, and psyllium husk or methylcellulose. These products are most convenient for general baking applications where a consistent, reliable result across different recipe types is valued over optimising for a specific application. Follow package directions for equivalence ratios, which typically range from 1 teaspoon to 1 tablespoon of powder per egg replaced. Silken tofu — the softest variety, with a custard-like texture — is an excellent egg substitute in recipes where eggs contribute richness, moisture, and a soft set rather than structural firmness. Quarter cup (60g) of blended silken tofu replaces one egg in pancakes, quick breads, chocolate cakes, brownies, and cheesecakes. Its neutral flavour, high protein content, and smooth texture when blended make it particularly effective in dense, moist baked goods and in no-bake dessert applications. It does not aerate or leaven, so it is unsuitable for applications that require whipped egg white foam.

Overripe mashed banana and unsweetened applesauce are practical, economical, and widely available egg substitutes that work well in specific baking applications where their flavour and natural sugars are acceptable. One quarter cup (approximately 60g) of mashed banana or applesauce replaces one egg in sweet quick breads, muffins, pancakes, cookies, and cakes. Both provide moisture and binding through their natural pectin content, and their sugar contributes to browning through caramelisation. The limitations are flavour contribution (banana flavour is distinctive and dominant in subtle recipes) and that neither provides leavening or protein structure. Banana works best in banana bread (obviously), chocolate chip muffins, and strongly flavoured cakes where its flavour is complementary. Applesauce is more neutral and works in a wider range of sweet baking applications. Both substitutes tend to produce slightly denser, moister baked goods than egg-containing versions. Pumpkin purée is a similar option — approximately 60g replaces one egg in spiced breads and muffins, adding moisture, binding, and a subtle earthy sweetness. Avocado — mashed — works similarly in chocolate-based baked goods where its grassy flavour is masked and its fat content enriches the crumb.

Eggs in savoury cooking perform different functions than in baking — primarily as the main ingredient themselves (scrambled eggs, omelettes, frittatas) or as structural binders in items like veggie burgers, meat-free balls, and breading coatings. Firm tofu crumbled and pan-fried with turmeric (for colour), black salt (kala namak, which contains sulphur compounds that replicate egg's distinctive flavour), nutritional yeast, and aromatics creates a convincing scrambled egg alternative with similar protein content and a satisfying texture. Black salt is the single most impactful ingredient for replicating egg flavour in savoury applications — its high sulphur content produces the same volatile sulphur compounds (hydrogen sulphide, dimethyl sulphide) that characterise egg's distinctive aroma. For frittata and baked egg-based dishes, blended silken tofu combined with chickpea flour (which sets on heating due to its protein content), black salt, nutritional yeast, and turmeric produces a reasonable approximation of a baked egg dish. Chickpea flour-based batters (socca in French cuisine, besan dishes across South Asian cooking) can replace egg-based pancakes and frittata bases. For coating foods in breadcrumbs, aquafaba or a thin flax egg slurry works as effectively as beaten egg in creating a surface that allows breadcrumbs to adhere.

The key to successful egg-free cooking is a reference framework that matches each substitute to its optimal application. For meringue, mousse, and aerated desserts: aquafaba (whipped) is the only viable option. For cookies, muffins, quick breads, and brownies where binding is primary: flax egg, chia egg, or commercial replacer. For dense, moist cakes and cheesecakes: blended silken tofu or banana/applesauce. For pancakes and waffles: a combination of flax egg and baking powder provides both binding and leavening. For quiche, frittata, and baked savoury dishes: chickpea flour batter or silken tofu mixture with black salt. For tofu scramble: crumbled firm tofu with turmeric and black salt. For mayonnaise and creamy emulsified sauces: aquafaba or soy milk provides the lecithin-like emulsification needed. These techniques align well with the paleo cooking philosophy of working with whole, minimally processed ingredients to achieve great results. For breading and coating: aquafaba or thin flax slurry as an adhesive. The most useful investment for a committed vegan baker is developing familiarity with aquafaba, flax eggs, and silken tofu — these three cover the vast majority of egg functions across both sweet and savoury cooking, and each can be prepared in minutes from widely available ingredients.