Best Substitutes for Egg Yolk
Egg yolk runs 33% fat and 48% water, with the rest being protein and lecithin. That lecithin is the magic ingredient. It binds water and fat together, which is why mayo doesn't separate and why pastry cream stays smooth.
The yolk's job changes with the recipe. In mayo or hollandaise, it emulsifies. In custards, it thickens at 160F. In pasta dough, it adds richness and color. In cookies, it creates chewiness through fat and protein.
Picking the right substitute means matching the specific job. A thickener works for custard but fails in mayo. An emulsifier handles sauce but won't give pasta that golden color.
Best Overall Substitute
Whole egg at a 1:1 ratio. One large egg replaces two yolks in most recipes. You lose some richness (whole eggs are 10% fat vs yolks at 33%) but gain simplicity. Add 1 teaspoon butter per egg to compensate for the missing fat in baked goods.
All Substitutes
Whole egg
1 whole egg per 2 yolksA large egg contains about 1 tablespoon of yolk. Using the whole egg dilutes the fat from 33% to 10% but keeps the lecithin for emulsification. Custards set firmer because egg whites coagulate at 140F while yolks set at 160F. Pasta gets slightly less rich but holds together fine.
Aquafaba (chickpea liquid)
3 tablespoons per yolkThe proteins in chickpea cooking liquid mimic egg's binding properties. It whips to soft peaks and holds air bubbles. Zero fat content means baked goods turn out drier. Add 1 teaspoon oil per 3 tablespoons aquafaba to compensate. Works at pH 6-8, so avoid acidic recipes.
Cornstarch slurry
1 teaspoon cornstarch + 3 tablespoons water per yolkCornstarch thickens at 203F, creating a gel that mimics yolk's texture in cooked applications. Mix cold to prevent lumps. No emulsification power, so sauces may separate. Adds zero flavor or color. Final texture is glossier and less creamy than egg yolk.
Ground flax seed
1 tablespoon flax + 3 tablespoons water per yolkFlax forms a gel when mixed with water. Let it sit 5 minutes until thick. The mucilage binds ingredients but won't emulsify fats. Adds a nutty flavor and brown specks. Works best in recipes with strong flavors that mask the flax taste.
Commercial mayonnaise
1 tablespoon per yolkMayo already contains emulsified egg yolk (about 8% by weight). In sauces, it provides instant emulsification without raw egg. The vinegar and salt change flavor profiles. Fat content runs 75-80%, much higher than plain yolk.
Silken tofu
2 tablespoons blended per yolkBlend until completely smooth, about 60 seconds. Proteins in tofu provide structure but zero emulsification. Works through mechanical binding rather than chemical. Adds moisture without fat. Neutral flavor disappears in strong-tasting dishes.
Greek yogurt
1 tablespoon per yolkFull-fat Greek yogurt runs 10% fat and provides tang from lactic acid. The proteins help with binding but curdle above 180F. Stir into hot liquids off heat. Works best in cold or gently heated applications.
Cashew cream
2 tablespoons per yolkSoak raw cashews 4 hours, then blend with equal parts water until smooth. Creates richness through 48% fat content. No emulsification properties but adds creamy mouthfeel. Slightly sweet flavor works better in desserts than savory dishes.
How to Adjust Your Recipe
Temperature matters more with egg substitutes. Cornstarch needs 203F to thicken fully, while eggs curdle at 185F. Lower heat by 25F when using yogurt or tofu to prevent breaking.
For emulsified sauces, add substitutes slowly. Stream in oil over 2-3 minutes instead of 30 seconds. The weaker emulsification needs time to develop.
In baking, egg yolk contributes to the Maillard reaction that creates golden-brown color. Brush items with milk or cream before baking to compensate. Add 1/4 teaspoon turmeric per recipe for color in pasta or custards.
When Not to Substitute
Classic French sauces built on yolk emulsification (hollandaise, bearnaise, sabayon) need the real thing. The lecithin in yolks creates stable emulsions that no substitute matches perfectly.
Fresh pasta gets its silky texture and golden color specifically from yolks. Whole eggs make it chewier. Vegan substitutes create gummy pasta.
Ice cream and frozen custards rely on yolk's lecithin to prevent ice crystals. Substitutes create icy textures. Lemon curd needs both the thickening and the richness that only concentrated yolks provide.
Frequently Asked Questions
Can I make mayonnaise without egg yolks?
Yes, using 3 tablespoons aquafaba plus 1 cup neutral oil. The aquafaba must be thick (reduce by half if needed). Add oil drop by drop for the first 1/4 cup, then stream slowly. Success rate runs 70% compared to 95% with real yolks. The texture is lighter and less stable. Keeps 3 days refrigerated versus 2 weeks for regular mayo.
What's the best egg yolk substitute for custard?
Cornstarch slurry (1 tablespoon cornstarch in 3 tablespoons milk per yolk) thickens custard reliably. Heat to 203F for full thickening. The texture is glossier and less rich than egg custard. Add 1 tablespoon butter per cup of liquid for richness. For vegan custard, use 2 tablespoons cashew cream plus 1 teaspoon cornstarch per yolk.
How many egg yolks equal one whole egg?
Two large yolks equal one whole egg by volume (3 tablespoons). By weight, two yolks (36g) slightly exceed one whole egg (50g) in fat but lack the protein structure. In cookies, two yolks make them richer and chewier than one whole egg. In custards, two yolks create a silkier texture that sets at 160F versus 180F for whole eggs.