Easy, savory and delicious Sautéed Mushrooms and Onions are a classic. They make a great topping for steak, burgers or even as a side dish.

Have you ever wanted to have that classic steakhouse experience at home? The perfectly cooked steak is just one aspect (I can help you out with that here with this Flat Iron Steak Recipe). But you’ve also got to have the sides, sauces and toppings to go along with it.

I’m sharing one of the classics today to get you one step closer to making the perfect steakhouse meal all on your own: Sautéed Mushrooms and Onions. 

Overhead photo of sauteed mushrooms and onions in a cast iron skillet.

They are savory and full of umami flavor. They are the perfect compliment to all kinds of meat dishes including grilled steaks, pork and burgers. 

Perfectly Sautéed Mushrooms and Onions, take a little bit of time. That is because it takes time for the vegetables to get golden brown and caramelized. But other than that, they are easy peasy to make! Let me show you how. 

Ingredients needed: 

Overhead photo of sliced onions and mushrooms on wooden cutting board.

MUSHROOMS: Any button mushrooms will do!  My favorite are crimini which are sometimes labeled baby bella in the grocery store. They have an earthy flavor I love but white mushrooms work as well! 

ONION: Walla walla sweet or vidalia onions are perfection here because of their hint of sweetness that is even more enhanced by caramelization. In a pinch, yellow onion will work too. 

DES’ TIP: Walla walla and Vidalia onions are often considerably bigger than yellow onions. Because of this, if you substitute yellow onions use 2 medium yellow onions for the 1 walla walla. 

GARLIC: Because garlic makes everything better. 

BUTTER: This will help give the vegetables their golden brown color. 

EXTRA VIRGIN OLIVE OIL: Adding a touch of olive oil to the butter will help prevent the butter from burning. 

WORCESTERSHIRE SAUCE: Adds a deeper, more complex savory flavor to just about any dish. 

Umami mushroom powder package

UMAMI MUSHROOM POWDER: This is optional but I just found it recently and have been using it on everything. Umami is the a Japanese word that translates to “pleasant savory taste”. It is that rich savory taste that you get from foods like mushrooms, soy sauce and miso. This powder is actually made from mushrooms so it only enhances the mushroom flavor in this dish. I bought this on Amazon but you can also buy it at Trader Joe’s or make your own. 

Step by Step Photos and Instructions: 

Step by step photos for how to make sauteed mushrooms and onions.

STEP #1: Heat butter and olive oil in a skillet over medium heat until the butter melts. About 1 minute. 

STEP #2: Add in mushrooms. Cook until mushrooms have released their liquid and start to brown. About 10 minutes. 

STEP #3: Add sliced onions and Worcestershire. Cook until softened and caramelized. About 15 minutes. 

STEP #4: Add in garlic, salt, pepper and umami powder if using. Cook just a couple minutes more or until garlic is fragrant. 

These sautéed mushrooms and onions are fantastic on steak. But they are also great when added to burgers, on top of baked potatoes or as a savory side dish. 

Overhead photo of sauteed mushrooms and onions in a cast iron skillet.

Storing and reheating leftovers: 

If you’ve got any leftovers store covered in the refrigerator for up to 3 days. To reheat simply place in a pan and cook on low until warmed through. You shouldn’t need to add anymore butter or oil. 

Want to make your own Steakhouse meal at home? I have got you covered with the must haves! 

Horseradish Cream Sauce 

Peppercorn Sauce 

Instant Pot Baked Potatoes

Homemade Caesar Dressing

Are you an umami mushroom loving fan? Here are some of my favorite mushroom recipes: 

Sausage Stuffed Mushrooms

Air Fryer Mushrooms

Red Wine Mushrooms

Asparagus and Mushroom Risotto

Herb Mushroom Cheese Bread

Roast Beef Mushroom Sliders

Sautéed Mushrooms and Onions
5m
Prep
30m
Cook
35m
Total

Servings

4

Ingredients

  • 3 tablespoons unsalted butter
  • 1 teaspoon extra virgin olive oil
  • 3 cups sliced mushrooms
  • 1 walla walla onion (sliced)
  • 1 tablespoon Worcestershire
  • 1/2 teaspoon salt
  • 1/2 teaspoon pepper
  • 1/4 teaspoon umami mushroom powder

Instructions

  1. Heat butter and olive oil in a skillet over medium heat until butter melts.
  2. Add in mushrooms. Cook until the mushrooms release their liquid and start to brown, about 10 minutes.
  3. Add in sliced onions and Worcestershire. Cook until softened and caramelized about 15 minutes.
  4. Add in garlic, salt, pepper and umami mushroom powder (if using). Continue cooking 1 - 2 more minutes or until garlic is fragrant. Adjust seasoning with salt and pepper if needed. Serve immediately.
Nutrition Facts
Amount per serving
Calories
129
% Daily Value*
Total Fat 10g 13%
Saturated Fat 6g 28%
Cholesterol 23mg 8%
Sodium 403mg 18%
Total Carbohydrate 9g 3%
Dietary Fiber 1g 5%
Total Sugars 6g
Protein 2g
* The % Daily Value tells you how much a nutrient in a serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
★★★★★ 5.0 (1 reviews)
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Deseree

Whether it is cooking it, eating it, shopping for it or watching TV about it, food is one of my favorite things.

1 Review

  1. Kari Alana September 5, 2020

    This is the perfect side condiment to just about any meat dish and even perfect as a vegetarian substitute

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