Name: Sautéed Mushrooms and Onions
Prep time: 5 min
Cook time: 10 min
Total time: 15 min
Yield: 6
Ingredients: 3 Tbsp. unsalted butter; 1 pound white mushrooms (sliced); 1 sweet yellow onion (sliced); 1/2 tsp salt; 1/2 tsp pepper; 2 Tbsp. Worcestershire sauce

Sautéed mushrooms and onions are the perfect, versatile side dish! With just a few simple ingredients, easy sautéed mushrooms and onions pair perfectly with grilled steak, as a juicy burger topping, or as a savory side dish for any protein.

They’re also super easy to make and are ready in under 15 minutes. This is one of our favorite easy side dishes for steaks.

sauteed mushrooms and onions in a black cast iron skillet

Ingredients for Sautéed Mushrooms and Onions

3 Tbsp. butter or olive oil
1 pound sliced white mushrooms or mushrooms of choice
1 sweet yellow onion – sliced
1/2 tsp. salt
1/2 tsp. pepper
2 Tbsp. Worcestershire sauce

How to Sauté Onions and Mushrooms

Making sautéed mushrooms and onions is so simple, you’ll be done in under 15 minutes from start to finish:

In a skillet, melt the butter over medium-high heat.
Add the mushrooms and cook for 5 minutes – they should begin to sweat and brown.
Reduce heat to medium, add the sliced onion, salt, pepper, and Worcestershire sauce and cook for another 5-7 minutes, stirred frequently, or until the onions are soft and brown.

Tips for making Mushrooms and Onions

Please be careful not to burn the melting butter. If you do so, you will have to start all over.
Cook the mushrooms over medium-high heat. Since they release a lot of moisture so they must be cooked over high heat and stirred constantly so they do not burn.
Add the onions when the mushrooms are cooked to turn golden brown around the edges and translucent.
Add the garlic in the end. Reduce the heat to low and stir frequently. Garlic burns easily and there is nothing worse than the taste of burnt garlic.

Is Mushroom a Vegetable?

In culinary terms, mushrooms are somewhat treated like a vegetable. they are used as a savory ingredient in recipes, usually alongside meats or vegetables.

Many times, they are used as meat substitutes, such as a grilled Portabello mushroom cap. In scientific terms, mushrooms are not a vegetable, they are an edible fungus.

Are Mushrooms Good for you?

We love the fact that mushrooms are very healthy for you! Mushrooms are packed with nutritional value, from fiber and protein to important nutrients like Vitamin B and D.

They’re also a great source of protein for those on a plant-based diet. Onions are low in calories and also contain fiber and important nutrients.

Sautéeing mushrooms and onions in butter does not overly saturate them, so they’re still a great source of your daily vegetable intake.

Can you Freeze Mushrooms and Onions?

Yes! You can freeze mushrooms. After sautéeing the mushrooms and onions you can let them cool, then transfer to an air-tight container and freeze for up to three months.

To reheat, simply let them thaw in the refrigerator, then reheat in a skillet with a few tablespoons of butter over medium heat until warmed.

Sauteed mushrooms and onions in a skillet with a wooden spoon, ready to serve

Mushroom Side Dish Recipe

Mushrooms and onions make the perfect savory side dish. Sauteed mushrooms and onions for steak take a regular steak to an over the top experience!

They also make a great topping for your burgers, like on top of this Mushroom Swiss Burger.

Prime Rib side dishes are always a great addition to your holiday table. If you’re looking for an easy side dish this holiday season that’s also savory and delicious, sautéed mushrooms and onions are definitely for you. They require minimal ingredients, a short cook time, and can be frozen for later use for up to three months! You can’t get much simpler than that!

You must try our easy mushroom and onion recipe with some of our favorite Prime Rib Recipes:

Try topping some of our favorite grilled steak recipes with this onions and mushrooms recipe:

How to Reheat a Steak|How to Reheat Prime Rib

You can make our recipe for mushrooms and onions and add thinly sliced pieces of steak and heat for approximately 3-5 minutes. You will love this recipe for steak bites! They are so good that no one will know you are serving leftovers.

We are in love with our easy Mushroom Risotto Recipe side dish! It is truly the perfect side dish!

Recipe Tip: We used white mushrooms in this recipe but, we also love shiitake mushroom or baby portobello mushrooms if preferred. Shiitake mushrooms and portobello are a great substitute in this recipe.

Love cooking plant-based recipes? Try these vegetarian mushroom recipes…

Chicken and Mushroom Recipes

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