Several things can make bread and other baked goods rise without yeast. The most common alternatives are baking soda, baking powder, and steam, but lesser-known options like bacterial fermentation and baking ammonia have been used for centuries. Each works through a different mechanism, and the best choice depends on what you’re baking.
Baking Soda and an Acid
Baking soda is pure sodium bicarbonate. On its own it does nothing, but the moment it contacts an acid, it produces carbon dioxide gas, which creates bubbles that lift your batter or dough. Common acids that trigger this reaction include buttermilk, yogurt, lemon juice, vinegar, molasses, and brown sugar. The reaction starts immediately on contact, which is why recipes using baking soda tell you to get the batter into the oven quickly.
Baking soda is roughly four times stronger than baking powder by volume. A quarter teaspoon of baking soda paired with half a teaspoon of cream of tartar replaces one teaspoon of baking powder. You can also combine a quarter teaspoon of baking soda with one teaspoon of lemon juice or white vinegar for the same effect. The key is getting the ratio right: too much baking soda without enough acid leaves a soapy, metallic taste in the finished product.
Baking Powder: The All-in-One Option
Baking powder is simply baking soda pre-mixed with a dry acid (often cream of tartar) and a starch to keep them from reacting in the container. It doesn’t need an acidic ingredient in the recipe because it carries its own acid.
Most baking powder sold today is “double-acting,” meaning it reacts in two stages. It produces some gas when mixed into a wet batter, then releases most of its carbon dioxide when it hits oven heat. That two-stage reaction gives you more flexibility. You can mix a muffin batter, let it sit for a few minutes, and still get good rise. Single-acting baking powder, which reacts only on contact with liquid, is less common and less forgiving.
Baking powder is the primary leavener in quick breads, pancakes, biscuits, muffins, and cakes. It won’t develop the chewy, elastic crumb that yeast creates, but for tender, crumbly baked goods, it’s ideal.
Steam
Water turns to steam at 212°F (100°C), and when it does, it expands dramatically. In a hot oven, the moisture trapped inside dough or batter vaporizes and pushes the structure outward before the starches set. This is the primary rising force behind popovers, pâte à choux (the dough used for cream puffs and éclairs), puff pastry, and Yorkshire pudding.
Steam also plays a supporting role in yeast breads and sourdough. During the first few minutes of baking at high temperatures (often around 210°C/410°F or higher), the moisture in any dough contributes to what bakers call “oven spring,” that final burst of expansion before the crust firms up. In high-moisture doughs, this effect is especially pronounced. The expanded gas cell structure also helps heat penetrate more evenly, which drives out additional water and sets the crumb.
Mechanical Leavening: Beating Air In
Whipping eggs or creaming butter with sugar physically traps air bubbles in a batter. Those bubbles expand when heated, lifting the final product. Angel food cake relies entirely on whipped egg whites for its rise. Sponge cakes, chiffon cakes, and soufflés use the same principle, sometimes with a small assist from chemical leaveners.
This is also what’s happening when you fold butter into laminated dough for croissants or puff pastry. The thin layers of butter create pockets. In the oven, the butter melts, the water in the butter turns to steam, and each pocket puffs up into a distinct flaky layer. So the rise in a croissant comes from a combination of mechanical layering and steam, not just from the yeast in the dough.
Bacterial Fermentation: Salt-Rising Bread
Before commercial yeast was widely available, Appalachian bakers made salt-rising bread using a starter made from flour, milk, and potatoes. Despite the name, salt isn’t the leavening agent. Research from the University of Pittsburgh identified the actual rising agent as Clostridium perfringens, a bacterium naturally present in the environment. It ferments the starch in the starter and produces gas, much like yeast does, but yields a distinctly different flavor: dense, tangy, and slightly cheese-like.
Salt-rising bread is a niche tradition today, but it’s a genuine yeast-free leavened bread with a history stretching back centuries. The starter requires careful temperature control (kept warm, around 100°F) and can be finicky, which is part of why it fell out of mainstream use once packaged yeast became cheap and reliable.
Baking Ammonia (Ammonium Bicarbonate)
Before baking soda existed, European bakers used ammonium bicarbonate, sometimes called hartshorn or baker’s ammonia. When heated, it breaks down completely into carbon dioxide, ammonia gas, and water. Because the ammonia fully escapes during baking, it leaves no residual taste, but only in thin, low-moisture products where the gas can exit completely. In a thick loaf of bread, trapped ammonia would make it inedible.
That’s why baking ammonia is still used today specifically for thin cookies, crackers, and biscuits. Traditional recipes in Northern Europe, Germany, Switzerland, and Scandinavia call for it to achieve a distinctly light, crispy texture that baking powder doesn’t quite replicate. You can find it in specialty baking stores or online, though most home bakers have never encountered it.
Potassium Bicarbonate for Low-Sodium Baking
If you’re watching your sodium intake, potassium bicarbonate can partially or fully replace standard baking soda. It produces the same carbon dioxide gas but swaps the sodium for potassium. You need about 19% more by weight to get the same amount of gas, so recipes require slight adjustment.
The flavor difference is actually pleasant. Unlike some potassium-based ingredients that taste metallic, potassium bicarbonate can enhance sweetness in baked goods. In cookie tests, leavening with potassium bicarbonate produced cookies with increased diameter and height, a golden brown color, and a sweeter flavor compared to those made with regular baking soda.
High-Altitude Adjustments
Chemical leaveners behave differently at elevation because lower air pressure lets gas bubbles expand more easily. Baked goods can rise too fast, then collapse. If you live above 3,000 feet, reducing the amount of baking powder or soda helps. Utah State University Extension recommends these reductions per teaspoon of baking powder:
- 3,000 feet: reduce by 1/8 teaspoon
- 5,000 feet: reduce by 1/8 to 1/4 teaspoon
- 7,000 feet: reduce by 1/4 teaspoon
For quick breads at any of these elevations, a general rule is to cut the baking powder or soda by one quarter. You may also need to increase oven temperature slightly and reduce sugar, since sugar weakens the structure that holds the rise in place.