Yes, you can replace buttermilk with regular milk, but you need to add an acid to match buttermilk's tangy flavor and chemical behavior
Buttermilk is milk that has been fermented or had an acid added to it, which gives it a thicker texture and sour taste. When you use regular milk alone in a recipe that calls for buttermilk, your baked goods won't rise the same way and will taste flat. The fix is straightforward: add an acid to regular milk and let it sit for a few minutes before using it.
The most common acids to use are lemon juice, white vinegar, or cream of tartar. A tablespoon of lemon juice or vinegar mixed into a cup of regular milk will curdle slightly and thicken, creating a substitute that behaves like buttermilk in your recipe. This method works for almost all baking and cooking uses.
Key Takeaways
- Mix one tablespoon of lemon juice or white vinegar into one cup of regular milk and let it sit for five minutes to create a buttermilk substitute.
- You can also use one-third teaspoon of cream of tartar per cup of milk, though you may need to stir it in thoroughly.
- The acid reacts with baking soda in recipes, so the substitute works best in baked goods that use baking soda as a leavening agent.
- For recipes that use baking powder instead of baking soda, the substitute still works but the rise may be slightly less pronounced.
The lemon juice or vinegar method
Pour one cup of regular milk (whole, 2%, or skim all work) into a measuring cup or bowl. Add one tablespoon of fresh lemon juice or white vinegar. Stir gently and let the mixture sit at room temperature for five minutes. The milk will curdle slightly and thicken—this is exactly what you want.
After five minutes, the mixture is ready to use in your recipe. Use it in the same amount the recipe calls for buttermilk. This method works because the acid lowers the pH of the milk, which mimics what fermentation does to real buttermilk. The curdling also creates a thicker liquid that behaves more like buttermilk in baking.
Lemon juice tends to be slightly milder in flavor than vinegar, so if you want a more authentic buttermilk taste, white vinegar is the better choice. However, both produce nearly identical results in baking.
The cream of tartar method
If you don't have lemon juice or vinegar on hand, cream of tartar works as a substitute acid. Mix one-third teaspoon of cream of tartar into one cup of regular milk and stir well. Unlike the lemon juice method, you do not need to wait—you can use it right away.
Cream of tartar is a powder, so it takes a moment to dissolve completely. Stir thoroughly to break up any lumps before adding the mixture to your recipe. This method produces results very similar to the vinegar or lemon juice approach, though some bakers find it slightly less effective in recipes that rely heavily on the acid's reaction with baking soda.
Why the acid matters in baking
Buttermilk's acidity is crucial in baking because it reacts with baking soda to create carbon dioxide gas, which makes baked goods rise and become fluffy. When you use regular milk without acid, this chemical reaction doesn't happen, and your pancakes, biscuits, or cakes will be denser and flatter.
If a recipe calls for buttermilk and uses baking soda, the acid substitute is essential. If the recipe uses baking powder instead (which already contains acid), regular milk alone will work, but the results may be slightly less tender because you're missing the extra acid that would normally be present.
When to use the substitute in cooking, not just baking
Buttermilk substitutes work in more than just baked goods. You can use the milk-and-acid mixture in salad dressings, marinades, and sauces where buttermilk is called for. The tangy flavor will be similar, and the thinner consistency won't matter in these applications.
For fried chicken or other dishes where buttermilk is used to tenderize meat, the substitute works just as well. The acid in the mixture will break down the proteins in the meat the same way buttermilk does. Let the meat soak in the substitute for the time the recipe specifies.
Amounts to use for different recipe sizes
| Buttermilk Needed | Milk + Lemon Juice or Vinegar | Milk + Cream of Tartar |
|---|---|---|
| 1 cup | 1 cup milk + 1 tablespoon lemon juice or vinegar | 1 cup milk + 1/3 teaspoon cream of tartar |
| 1/2 cup | 1/2 cup milk + 1.5 teaspoons lemon juice or vinegar | 1/2 cup milk + 1/6 teaspoon cream of tartar |
| 1/4 cup | 1/4 cup milk + 3/4 teaspoon lemon juice or vinegar | 1/4 cup milk + 1/8 teaspoon cream of tartar |
What type of milk works best
Whole milk, 2% milk, and skim milk all work as the base for a buttermilk substitute. Whole milk will produce a slightly richer result because of its higher fat content, which is closer to real buttermilk. However, the difference is small enough that most people won't notice it in the finished recipe.
Non-dairy milks like almond milk, oat milk, or soy milk can also be used, though the results may vary slightly. Soy milk tends to work best among non-dairy options because it has a protein structure more similar to cow's milk. If you use a non-dairy milk, the curdling may be less visible, but the acid is still doing its job chemically.
Frequently Asked Questions
Can I use milk and lemon juice if I'm making something that doesn't use baking soda?
Yes. If your recipe uses baking powder or no leavening agent at all, regular milk with acid will work fine. The results may be slightly different in texture, but the recipe will still turn out. The acid is most critical when baking soda is the leavening agent.
How long can I store the milk and acid mixture before using it?
Use it within 30 minutes of mixing. The longer it sits, the more it separates and the less effective it becomes. If you're making a large batch, mix it right before you need it rather than preparing it in advance.
What if I don't have lemon juice or vinegar?
Cream of tartar is your best option. If you don't have that either, you can use plain yogurt thinned with milk (half yogurt, half milk), though this changes the flavor slightly. In a pinch, sour cream mixed with milk also works.
Will the substitute taste exactly like buttermilk?
It will be very close, especially in baked goods where other flavors dominate. In dishes where buttermilk's tangy flavor is the main event—like in a buttermilk dressing—the substitute will taste slightly different but still good. Real buttermilk has a more complex flavor from fermentation, but the acid substitute captures the essential sour note.
Can I use this substitute in pancakes and waffles?
Yes, this is one of the best uses for the substitute. Pancakes and waffles rely on the acid-and-baking-soda reaction to rise, so the milk-and-acid mixture works perfectly. Your pancakes will be just as fluffy as they would be with real buttermilk.