4.82 from 11 votes

Sautéed Mushrooms and Onions

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Soft, savory, and sautéed mushrooms and onions are deliciously caramelized in a cast iron pan and provide a perfect mushroom and onion side dish recipe.

Easily made in under 10 minutes, you cannot go wrong with sautéing up mushrooms. They are cost-effective, healthy, low in carbs, and go amazing on steak.

Sauteed Mushrooms and Onions Recipe
Deliciously perfect savory and sweet sautéed mushrooms and onions

Mastering the Sautee: Mushrooms and Onions

This quick and easy preparation method helps enhance the natural flavors of these two ingredients, resulting in a perfect side dish that pairs well with various main courses.

Combined with perfectly seasoned and sauté onions, garlic, and any other varied herbs and spices you love, you can serve sautéed mushrooms and onions as a stand-alone or a complimentary classic side dish. 

List of Ingredients

  • fresh mushrooms
  • white onions
  • butter
  • minced garlic
  • cooking sherry
  • soy sauce
  • kosher salt and freshly ground black pepper

Note that most wild mushrooms are packaged from the ground and contain bits of dirt. Clean mushrooms thoroughly before beginning this recipe.

How to Sauté Mushrooms and Onions

  1. Add sliced white button mushrooms, chopped onions, butter, and minced garlic to a large cast iron skillet.
  2. Heat mushrooms over medium heat, stirring ingredients frequently until onions and mushrooms are soft and tender, which takes about 6-8 minutes.
  3. Mix well with one tablespoon of cooking sherry and one tablespoon of soy sauce.
adding soy sauce, sherry, and minced garlic to onion and mushrooms
  1. Heat mushrooms and onions for 2 minutes until the caramelization process is done and excess liquid is burned off.
  2. Season golden brown mushrooms and onions with sea salt and cracked pepper.
  3. Once your mushrooms start to cook and soften up, add the remaining liquid ingredients cooking sherry and soy sauce ( low sodium is best, so it’s not too salty), and mix savory flavors until combined and hot.
  4. Store leftovers in an airtight container for up to 3 days. 
simple 10 minute side dish in a cast iron pan and on your oven with sauteed onions and mushrooms

Best way to Saute

Using a preseasoned cast iron skillet is the best way to saute. Grab a set of 2 preseasoned cast iron pans here– it will change how you cook!

Commonly Asked Questions

Should the pan be covered?

No. When you cover a skillet or cast iron pan, the liquid drops from the lid and essentially steams the ingredients versus cooking off and sautéing. 

How do you reheat leftover mushrooms and onions? 

Heat any side dish leftovers in the microwave for 30 seconds, or add to a pan with some butter and oil until warm again. 

Should onions or mushrooms be added first?

I like to add them both simultaneously, although some prefer a crispier onion and will give the onions about two extra minutes before adding the mushrooms to the pan. 

What are Caramelized Onions and Mushrooms?

Caramelizing is a term that means that you are browning up the food ingredients with a bit of sugar. While there is no sugar directly in this simple recipe, the soy sauce and sherry bring in just the right touch of robust flavors to make each mushroom pop full of flavor.

Also, with ingredients like cooking wines and cooking sherries, it’s great to have recipes that use them, or they can sit unused in the cupboard for a bit.

This recipe does just that – combine delicious, simple ingredients but surprise you with an easy side dish.

Variations for Sauteed Mushrooms and Onions 

Extra Flavor: Add fresh herbs like fresh thyme leaves, rosemary, dill, and parsley.

If you choose to use dried herbs, add them in at the beginning so they have time to soften, but if you use fresh herbs, add them near the end so they do not overcook.

CHANGE UP THE FLAVOR: Instead of soy and sherry, beef stock, teriyaki sauce, or white wine.

Sauteed Mushrooms and Onions for Steak: The Ultimate Topping

There’s nothing like a juicy steak topped with a delicious mushroom mixture. This mouthwatering combination adds a delightful layer of flavor to your steak, making it even more satisfying and gourmet.

Whether planning a fancy dinner or want to treat yourself, sautéed mushrooms and onions are a great way to elevate a beef dish.

Sautéed mushrooms and onions are also excellent on hamburgers, omelets, and egg sandwiches, added to sirloin steak bites, pork chop, juicy chicken, or breakfast casserole.

Earthy mushrooms and sautéed onions also add huge flavor mixed in with green beans

What are other great side dishes to enjoy mushrooms?

We love the whole roasted mushrooms recipe, which only takes 15 minutes.

Stuffed mushrooms will always be a huge party hit (or made to look like mummy mushrooms for a fun holiday idea).

Absolutely one of my favorites, creamy Tuscan garlic butter mushrooms, is to die for as a topping.

4.82 from 11 votes

Sautéed Mushrooms and Onions (Great for Steak!)

Cook Time 10 minutes
Total Time 10 minutes
10 Minute Sauteed Mushrooms and Onions Recipe with Minced Garlic, a simple and easy side dish that makes a great caramelized steak topping. Mushrooms smothered in delicious garlic, butter, onions, and soy sauce is the best combination!


  • 1 lb sliced mushrooms we recommend baby bella / button mushrooms
  • 1 onion chopped
  • 3 tablespoons butter
  • 1 tablespoon minced garlic
  • 1 tablespoon cooking sherry
  • 1 tablespoon soy sauce
  • salt and pepper


  • Add cleaned sliced white mushrooms, chopped onions, butter, and minced garlic to a large cast iron skillet.
    1 lb sliced mushrooms, 1 onion, 3 tablespoons butter, 1 tablespoon minced garlic
  • Heat mushrooms over medium heat, stirring ingredients frequently until onions and mushrooms are soft and tender, which takes about 6-8 minutes.
  • Add 1 tablespoon of cooking sherry and 1 tablespoon soy sauce and mix well.
    1 tablespoon cooking sherry, 1 tablespoon soy sauce
  • Continue to heat mushrooms and onions for 2 minutes, until mushrooms and onions are caramelized, and excess liquid is burned off. Do not add a lid to the pan.
  • Season mushrooms and onions with sea salt and freshly ground cracked pepper.
    salt and pepper
  • Serve this mushroom dish hot either as a side dish, topping on a burger, chicken, pork, or even as a savory add-on to an omelet or breakfast casserole.



If you prefer a crispier onion, add and cook onion about 1-2 minutes prior to adding mushrooms. This gives the onions a bit more time to cook and get more golden brown. This is just simply a preference. 
Mushrooms and onions make a great topping for steak, burgers, or even a mix in to vegetables like green beans. Enjoy! 


Serving: 1 | Calories: 126kcal | Carbohydrates: 10g | Protein: 3g | Fat: 9g | Saturated Fat: 6g | Polyunsaturated Fat: 3g | Cholesterol: 23mg | Sodium: 387mg | Fiber: 3g | Sugar: 4g

Nutritional Disclaimer: The nutritional data provided here is auto-calculated and intended for your convenience only. As it’s generated via automation, its accuracy may be compromised. For precise nutritional insight, please compute the values utilizing the actual ingredients in your recipe through your chosen nutrition calculator or application.

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4.82 from 11 votes

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Recipe Rating

One Comment

  1. Patricia Pomares says:

    Hi I love mushrooms and onions this is a good side dish, I will be making this receipe. Ty

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