These Air Fryer Mushrooms and Onions require just 7 ingredients and are ready in less than 20 minutes, including prep time and cooking time! They’re simple yet flavorful, and go perfectly with steak, pork and chicken, or as a topping for burgers (like these air fryer turkey burgers)!
If you love sautéed mushrooms and onions, you’ll love this version prepared in the air fryer. You get similar results without the hands on work of cooking them on the stove top. Just stir them once while they’re cooking, and the air fryer does the rest!
Table of contents
This recipe was originally published in January 2021 and was tested in a smaller capacity (2.75 quart) air fryer. Currently, my preferred air fryer is a larger capacity 5.8 quart, so I decided to update the recipe to reflect this. The revised version also includes new photos, a few minor additions to the recipe and more helpful tips for readers.
For more air fryer side dishes, check out this collection of 15+ quick and easy air fryer sides!
Ingredients and substitutions
Below is a brief overview of the ingredients and recommended substitutions. The recipe card at the end of this post includes the exact quantities used.
- Fresh mushrooms – I normally use cremini mushrooms (baby bellas) as I like the firm texture and earthy flavor. You can also use white or button mushrooms.
- Yellow onion – This is probably the most common type of onion. It has a strong flavor and it’s great for caramelizing. If you prefer a milder onion, try using a white or sweet onion.
- Olive oil – Some recipes call for oil and butter but we’re using all oil here. I prefer olive oil for the mild flavor, but avocado oil works too.
- Worcestershire sauce – Adding this was a reader recommendation and it adds a slight umami flavor.
- Seasonings – Just some salt, pepper and garlic powder. Feel free to also add some dried herbs like thyme or oregano.
How to air fry mushrooms and onions
Below is a brief overview of the steps to make this recipe along with photos. For further details, please see the recipe card at the end of this post.
Key recipe tips
- Mushrooms: They will shrink quite a bit so I usually cut them in half instead of into thin slices. If your mushrooms are large, you may want to quarter them.
- Onions: The onions won’t soften as much as sautéed onions and will still have a little bite. Cut them into 1/4-inch slices so they cook at the same rate as the mushrooms.
Recipe FAQs
You can clean mushrooms in two different ways. You can gently rub the dirt off each one with a paper towel. Or, you can rinse the mushrooms in a colander and pat them dry with a paper towel. I prefer to rub the dirt off as rinsing them may cause the mushrooms to absorb some water and affect how well they air fry.
The mushrooms should be browned and tender, but not too soft. They will also shrink in size. The onions will get translucent and start to caramelize around the edges. They should soften a bit but still have some bite. If you want them caramelized a bit more, air fry them for another few minutes. Just keep an eye on them as the mushrooms can start to dry out and the onions will burn.
The easiest way is to pop them in the microwave for 45-60 seconds, or until heated through. You can also reheat them in the air fryer on 350F for 3-5 minutes or in a skillet on the stove top.
More air fryer side dishes
If you make this recipe, I’d love to hear what you think in the comments below!
HUNGRY FOR MORE? Follow Crumb Top Baking on Instagram, Pinterest and Facebook!
Print
Air Fryer Mushrooms and Onions
- Prep Time: 5 minutes
- Cook Time: 13 minutes
- Total Time: 18 minutes
- Yield: 4 servings
- Category: Side Dish
- Method: Air Fry
- Cuisine: Canadian, American
- Diet: Vegetarian
Description
These Air Fryer Mushrooms and Onions require just 7 ingredients and are ready in less than 20 minutes, including prep time and cooking time. They make a delicious side dish for steak, pork and chicken, or as a topping for burgers!
Ingredients
- 1/2 pound (227g) cremini mushrooms, halved (or quartered, if large)
- 1 large yellow onion, cut lengthwise into 1/4 inch slices
- 2 tablespoons olive oil
- 2 teaspoons Worcestershire sauce
- 1/2 teaspoon fine sea salt salt
- 1/4 teaspoon ground black pepper
- 1/4 teaspoon garlic powder
Instructions
- Place all of the ingredients in a large bowl and toss together until the mushrooms and onions are well coated.
- Transfer to the air fryer basket and air fry on 400F for 11-13 minutes, or until the mushrooms are browned and tender and the onions start to caramelize around the edges. (Stir the mushrooms and onions at the halfway point to ensure they cook evenly).
Notes
- As the mushrooms shrink, I usually cut them in half instead of into thin slices. If your mushrooms are large, you may want to quarter them.
- The onions are cut into 1/4 inch slices so they cook at the same rate as the mushrooms. Thicker slices will be too firm when the mushrooms are ready.
- The onions won’t soften as much as sautéed onions and will still have a little bite.
- I used a 5.8 quart air fryer to make this recipe. If you’re using a smaller capacity air fryer, the basket will be full so you’ll need to add about 5 minutes to the air frying time and shake the basket more than once to rotate the mushrooms and onions around.
Try adding a splash of Worchestershire, maybe a teaspoon. Makes them taste like steakhouse mushrooms 😋
Sounds delicious. Thanks for the tip!
I love mushrooms and tonight had a taste a mushroom and onions so looked up an air fry recipe. Think I’m about to give this one a try!
I hope you enjoy the recipe!
I love mushrooms and onions, Leanne. I’ve been eating a ton of them lately! My kiddos would probably not touch this but that just means more for me 😉 I need to try them in the air fryer!
Haha thanks Katherine! I don’t think I was a fan of mushrooms and onions when I was a kid either. But you’re right, just means more for you!
Great idea. I’ve never though of doing mushrooms and onions in the air fryer but it would be so much easier! Definitely will have to try this. I usually just have this with steak or burgers but I really like the idea of putting it on pizza too!
Thanks Terry! They’re so good on pizza. Definitely worth a try!