Yes, you can use olive oil instead of vegetable oil in brownies, and they’ll usually turn out moist, fudgy, and fully set as long as you swap it in at a 1:1 ratio.

Quick Scoop

  • Use olive oil in place of vegetable oil 1:1 (same amount the recipe calls for vegetable oil).
  • Texture: Often more moist and fudgy, sometimes a bit denser.
  • Flavor: Slightly fruity or “olive” note, stronger with robust extra virgin; lighter or “light-tasting” olive oil is more neutral.
  • Best choice: Light or mild olive oil for classic-tasting brownies; robust extra virgin if you like a more complex chocolate flavor.
  • Health angle: More monounsaturated fats and fewer highly processed/refined components than many generic vegetable oils.

How to Swap Olive Oil into Brownies

Basic ratio (box mix or homemade)

  1. Check how much vegetable oil your recipe needs (for example, ½ cup).
  2. Use the same amount of olive oil instead—no extra math or baking-time changes usually needed.
  1. Mix it in exactly as you would vegetable oil (with the eggs and water in a box mix, or with the wet ingredients in homemade brownies).

For most recipes, you do not need to adjust pan size, oven temperature, or baking time; just start checking doneness at the usual time (a toothpick should come out with moist crumbs, not wet batter).

What Changes When You Use Olive Oil?

1. Texture

  • Brownies often become:
    • More moist at room temperature because olive oil is liquid at room temp.
* Nicely fudgy rather than cakey, especially in recipes that already lean fudgy.
  • Compared to butter-based brownies, olive-oil brownies may be slightly denser and less airy.

2. Flavor

  • Vegetable oil: Nearly flavorless, so it stays in the background.
  • Olive oil: Adds a gentle, sometimes noticeable flavor:
    • Light/“mild” olive oil: Subtle, often barely detectable under cocoa, chocolate, and vanilla.
* Robust extra virgin: Can add fruity, peppery, or grassy notes that some people love with dark chocolate.

If you’re nervous about the taste, start with a light olive oil and a very chocolatey recipe (cocoa powder plus chocolate chips). The chocolate tends to dominate, and most of the olive note “bakes out” or blends into the background.

Mini Forum-Style Take: Pros & Cons

“I swapped in olive oil because I ran out of vegetable oil, and my brownies turned out extra fudgy. My kids didn’t even notice the difference—just said they were ‘really chocolatey’.”

Pros

  • Moist, fudgy texture without special tricks.
  • Can be used in:
    • Boxed brownie mixes
    • From-scratch brownies
    • Butter-based recipes that allow oil substitution
  • Slight boost on the “better-for-you” side compared to many refined vegetable oils (more monounsaturated fats, fewer processing steps).
  • Great for dairy-free brownies if you’re also careful with your chocolate and mix-ins.

Cons

  • Flavor may surprise you if you use a strong, peppery extra virgin oil and a mild chocolate recipe.
  • Very strong or bitter olive oils can clash with very sweet, milk-chocolate-heavy brownies.
  • People expecting perfectly “neutral” bakery-style brownies might notice a slight difference and not know what it is.

Simple “Safe” Strategy for First-Time Swappers

If this is your first time using olive oil instead of vegetable oil in brownies:

  1. Choose a light or “mild” olive oil instead of a super robust extra virgin.
  1. Use the same volume the recipe lists for vegetable oil.
  2. Bake as directed, but:
    • Smell the batter: if the olive aroma is strong, remember it will mellow once baked and cooled.
  3. Let brownies cool completely before judging the flavor; the chocolate settles and the olive note softens.

An example: A boxed mix that calls for ½ cup vegetable oil, 2 eggs, and water can be made with ½ cup light olive oil, 2 eggs, and the same amount of water. You’ll get fudgy brownies with a slightly richer flavor and no extra steps.

Tiny SEO-Friendly Meta Note

If you’re writing about this for a recipe or food blog and want SEO benefits, you’d use the question “can you use olive oil instead of vegetable oil in brownies” in your title and early headings, then clearly answer yes, explain the 1:1 swap, and discuss flavor and texture changes in short, scannable sections.

TL;DR: Yes, you can use olive oil instead of vegetable oil in brownies with a straight 1:1 swap; expect moist, fudgy brownies with a slightly more complex, sometimes fruity chocolate flavor, especially if you use extra virgin.

Information gathered from public forums or data available on the internet and portrayed here.