Yes, you can replace butter with olive oil, but the swap works differently depending on what you're making

Olive oil can replace butter in most baked goods and cooked dishes, but the ratio and technique change based on whether you're baking a cake, making a sauce, or cooking vegetables. The main difference: butter is solid at room temperature and contains water, while olive oil is liquid and has no water content. This affects how your finished dish rises, browns, and tastes.

For most baking, use three-quarters cup of olive oil for every cup of butter the recipe calls for. For cooking—sautéing, roasting, or pan-frying—use a one-to-one swap. The type of olive oil matters too: extra-virgin has a strong flavor that works in salads and dressings but can overpower delicate baked goods, so use regular or light olive oil for baking.

Key Takeaways

  • In baking, replace one cup of butter with three-quarters cup of olive oil because olive oil has no water content and is denser than butter.
  • For cooking, sauces, and dressings, use a one-to-one swap—one cup of butter equals one cup of olive oil.
  • Extra-virgin olive oil has a strong flavor that works in savory dishes but can taste bitter or grassy in cakes and cookies; use regular or light olive oil for baking.
  • Olive oil makes baked goods less fluffy and more tender because it doesn't trap air the way butter does when creamed with sugar.
  • Baked goods made with olive oil brown faster and may need a slightly lower oven temperature or shorter baking time.

Replacing butter in cakes, cookies, and quick breads

The three-quarters cup rule comes from the fact that butter is about 15 to 20 percent water. When you cream butter with sugar, you're beating air into the mixture, which helps cakes and cookies rise. Olive oil can't trap air the same way, so you get a denser, more tender crumb—which is actually desirable in some cakes but not in others.

Cakes made with olive oil tend to be moister and stay fresh longer than butter cakes, but they won't be as fluffy. Cookies will spread a bit more and have a softer, chewier texture. Quick breads like banana bread or zucchini bread work especially well with olive oil because they're already dense and moist. Delicate layer cakes and angel food cakes don't work well with the swap because they depend on air bubbles to rise.

When you mix the olive oil into your batter, don't cream it with sugar the way you would butter. Instead, whisk the oil together with your wet ingredients (eggs, milk, vanilla) first, then fold in the dry ingredients. This prevents overdeveloping gluten, which would make your cake tough.

Replacing butter in cookies and brownies

Cookies made with olive oil spread more during baking because the oil doesn't solidify the way butter does. If you want thicker cookies, chill your dough for at least 30 minutes before baking. Brownies and bar cookies are excellent candidates for the swap—they'll be fudgier and more tender, and the olive oil flavor usually blends into the chocolate.

Watch your baking time closely. Olive oil conducts heat differently than butter, so your cookies or brownies may brown faster on the edges. Start checking them 1 to 2 minutes before the recipe's stated time. If the edges are browning too quickly but the center is still underbaked, lower your oven temperature by 25 degrees Fahrenheit and add a few minutes to the baking time.

Replacing butter in savory cooking and sauces

For sautéing vegetables, cooking pasta, or making pan sauces, swap butter and olive oil one-to-one with no adjustment needed. Olive oil actually has a higher smoke point than butter (around 375 to 405 degrees Fahrenheit for regular olive oil, compared to 350 degrees for butter), so it's better for high-heat cooking. Use extra-virgin olive oil here if you want—its flavor will shine in savory dishes.

When making a beurre blanc or other butter-based sauce, you can use olive oil, but the sauce will taste different and won't have the same silky mouthfeel. If you're making a vinaigrette or a cold sauce, olive oil is often the better choice anyway. For gravies and pan sauces where butter adds richness, olive oil works but produces a lighter result.

Choosing the right type of olive oil

Extra-virgin olive oil has a fruity, peppery, or grassy flavor that comes from minimal processing. It's wonderful in salads, dressings, and finished dishes where you want to taste the oil. In baking, that strong flavor can taste bitter or overwhelm delicate flavors like vanilla or lemon. For cakes, cookies, and quick breads, use regular or light olive oil, which has a neutral taste and lighter color.

Light olive oil is not lower in calories—it's just more refined and has a milder flavor. It also has a slightly higher smoke point than extra-virgin, making it better for baking at standard oven temperatures. If you only have extra-virgin on hand, it will work, but start with a smaller amount and taste as you go.

Common mistakes to avoid

Don't use the one-to-one ratio in baking. This is the most common error—using a full cup of olive oil for a cup of butter will make your cake or cookies greasy and heavy. Stick to three-quarters cup of oil for every cup of butter in baked goods.

Don't skip the temperature adjustment. Olive oil browns faster than butter, so if your recipe calls for 350 degrees Fahrenheit, try 325 degrees instead. Start checking your baked goods a few minutes early to avoid burnt edges.

Don't assume all olive oils taste the same. Extra-virgin in a chocolate cake will taste noticeably different—and not in a good way—compared to regular olive oil. Read the label or taste a small amount before committing a whole batch.

When olive oil doesn't work

Laminated doughs—croissants, puff pastry, Danish pastry—require solid fat that can be folded into layers. Olive oil won't work here because it's liquid and won't create those flaky sheets. Pie crusts and biscuits can technically be made with olive oil, but they'll be less flaky and more tender, which some bakers prefer but others don't.

Whipped frostings and buttercreams depend on butter's ability to hold air when beaten. Olive oil can't do this, so you can't make a traditional American buttercream with it. You can make an olive oil-based frosting, but it will be more like a glaze or a spread than a fluffy frosting.

Frequently Asked Questions

Can I use olive oil in a 1-to-1 ratio for brownies?

No—use three-quarters cup of olive oil for every cup of butter the recipe calls for. Brownies are denser than cakes, but they still need the right fat-to-flour ratio. A one-to-one swap will make them greasy.

Will my cookies spread too much if I use olive oil?

Yes, they'll spread more because olive oil doesn't solidify like butter. Chill your dough for 30 minutes before baking, and consider lowering your oven temperature by 25 degrees. This gives the dough time to set before the edges brown.

What's the difference between light and extra-virgin olive oil in baking?

Light olive oil has a neutral flavor and is better for baking because it won't compete with vanilla, chocolate, or fruit flavors. Extra-virgin has a strong, fruity taste that can taste bitter or grassy in sweet baked goods. Both have the same calorie content.

Can I use olive oil in a pie crust?

Yes, but your crust will be more tender and less flaky than one made with butter or shortening. Some bakers prefer this texture. Use three-quarters cup of olive oil for every cup of butter, and handle the dough as little as possible to avoid toughness.

Does olive oil change the taste of my cake?

Regular or light olive oil won't noticeably change the taste. Extra-virgin olive oil will add a fruity or peppery flavor that most people don't want in sweet baked goods. If you only have extra-virgin, use it in chocolate cakes or spiced cakes where the flavor might blend in.