Eggs do more structural work in baking than almost any other ingredient on this site, which is why recipe instructions get specific about temperature and size. Grabbing a cold egg straight from the fridge when a recipe wants room temperature, or using jumbo when it was written for large, can genuinely change how a batter comes together.
Egg Sizes and Why They Matter
U.S. egg sizes are standardized by weight per dozen, not by the individual egg’s appearance. Almost every baking recipe (including everything on this site) is written and tested using large eggs. Using a different size without adjusting throws off the ratio of liquid to dry ingredients, especially in recipes with only one or two eggs where the difference is proportionally bigger.
- Large egg: about 3.25 tablespoons (50g) — the baking standard
- Extra-large egg: about 4 tablespoons (56g)
- Medium egg: about 3 tablespoons (44g)
- Jumbo egg: about 4.25 tablespoons (63g)
Why Egg Temperature Changes the Result
Room-temperature eggs emulsify into batter far more smoothly than cold eggs, which is why creamed butter-and-sugar recipes specifically call for room-temperature eggs — a cold egg can cause the fat to seize and separate, leaving a curdled-looking batter that bakes up dense. If you forgot to set eggs out, submerge them (still in the shell) in warm water for about 5 minutes to bring them to temperature quickly.
What Eggs Actually Do in a Recipe
- Structure: egg proteins coagulate (set) when heated, which is a major part of what holds cakes, cookies, and quick breads together as they bake.
- Emulsification: egg yolks contain lecithin, a natural emulsifier that helps fat and liquid ingredients combine smoothly instead of separating — critical in custards, mayonnaise, and rich batters.
- Leavening: beaten eggs (whole or whites alone) trap air that expands in the oven, contributing lift independent of baking soda or powder — this is most visible in recipes like popovers and soufflés that rely heavily on whipped egg for rise.
- Moisture and richness: egg yolks add fat and moisture that make crumb texture softer and richer, which is part of why recipes with more yolks (relative to whites) tend to be denser and more tender.
- Browning: an egg wash (beaten egg brushed on dough before baking) promotes browning and shine on the crust of breads and pastries.
Substituting for Eggs
None of these fully replicate what eggs do, but they work reasonably well in specific roles:
- For binding/structure: 1 tablespoon ground flaxseed mixed with 3 tablespoons water, rested 5 minutes, replaces one egg
- For moisture: ¼ cup unsweetened applesauce or mashed banana replaces one egg, best in quick breads and muffins where a denser result is acceptable
- For leavening in a pinch: 1 teaspoon baking powder plus 1 tablespoon water plus 1 tablespoon oil approximates one egg’s leavening contribution, though not its structure
Buying Guide
Large eggs cover every recipe on this site — there’s no reason to reach for anything else unless a specific recipe says otherwise. Beyond size, the main practical choice is between conventional and pasture-raised/organic, which is a personal and price decision rather than one that changes baking performance in any of the recipes here.
Recipes on CopyKitchen That Use Eggs
- Homemade Krispy Kreme Glazed Doughnuts
- How to Make Cinnabon’s Cinnamon Rolls at Home
- Copycat Subway Italian Herb and Cheese Bread
- Make Starbucks Lemon Loaf at Home for Less
- Pumpkin Bread Just Like Starbucks’s
- Homemade Cracker Barrel Pancakes
- Copycat Starbucks Banana Bread
- Fluffy Copycat IHOP Buttermilk Pancakes
Frequently Asked Questions
Why do recipes specify room-temperature eggs?
Room-temperature eggs blend smoothly into creamed butter and sugar. Cold eggs can cause the fat to seize, leaving a curdled-looking batter that bakes up denser than intended.
Can I use egg substitute products instead of real eggs?
Liquid egg substitute products work reasonably well for scrambling and general cooking, but they lack the fat content of a whole egg (most are egg whites plus additives), so baking results can be noticeably different in richness and structure.
What size eggs should I use if a recipe doesn’t specify?
Assume large eggs. It’s the U.S. baking industry standard and what virtually every published recipe, including everything on this site, is tested with.
