Easy Sautéed Mushrooms and Onions are a perfect, versatile side dish recipe! With just a few simple ingredients, this simple mushroom recipe pairs perfectly with grilled steak, as a gourmet burger topping, or as a savory side dish for any protein.
Caramelized onions and mushrooms are also super easy to make and are ready in under 15 minutes!
🍽 What do I need to saute mushrooms and onions?
All you need to make this easy mushroom side dish is a skillet on the stove-top.
This is one of the easiest and best side dishes for steaks, chicken, pork chops, and more! Because it’s so simple and my family loves it, I cook it up all of the time to serve with our family dinner ideas.
🧅 Ingredients to Make Sauteed Mushrooms and Onions
- Butter or olive oil
- Sliced white mushrooms, or mushrooms of choice
- Sweet yellow onion, sliced
- Salt and pepper
- Worcestershire sauce
🍄 How to Clean Mushrooms
When cleaning mushrooms, you want to wipe them down or very gently rinse them instead of soaking them in water.
Mushrooms absorb water and can become mushy, so it is not a good idea to let them take on too much water.
- If using whole mushrooms, before slicing, wipe each mushroom down with a damp paper towel. You can gently rinse the mushrooms under cool water, but you must dry them with paper towels completely after rinsing. Don’t let them soak!
- If using sliced mushrooms, and you want to give them an extra clean, place them in a colander and rinse under cool water. Once again, make sure to dry them with a paper towel and do not let them soak.
Properly cleaning mushrooms rather than allowing them to soak will give you perfectly browned mushrooms for your sauteed onions and mushrooms.
🥘 How to Sauté Onions and Mushrooms
Sauteing mushrooms and onions is so simple, you’ll be done in under 15 minutes from start to finish. But for being such a quick side dish recipe, it is so flavorful!
- In a skillet, melt butter over medium-high heat.
- Add 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, stirring frequently, or until the onions are soft and brown.
- That’s it! Serve with dishes like pork chops, roast chicken breast, or steak, and enjoy. Don’t forget the garlic butter!
This recipe makes the perfect savory side dish. Sauteed mushrooms and onions for steak take a regular steak to an over the top experience! Especially with a pat of garlic butter.
They also make a great topping for your burgers, like on top of this Mushroom Swiss Burger. You just can’t beat sauteed mushrooms and onions for burgers.
⭐ Family Foodie Tips
- Don’t burn the butter. Please be careful not to burn the melting butter. If you do, you will have to start all over!
- Cook the mushrooms over medium-high heat. Since they release a lot of moisture, they must be cooked over high heat and stirred constantly so they do not burn.
- Add the onions when the mushrooms are cooked until they turn golden brown around the edges and become translucent.
- Try another type of mushroom! We used white mushrooms in this sautéed onions and mushrooms recipe, but we also love shiitake mushroom or baby portobello mushrooms if you prefer. Shiitake mushrooms and portobello are a great substitute in this recipe!
💭 Questions about Making Mushrooms and Onions
Is mushroom a vegetable?
In culinary terms, mushrooms are basically a vegetable. They are used as a savory ingredient in recipes, usually to complement meats or other vegetables.
You can even use mushrooms as a meat substitute, such as a grilled Portobello mushroom cap.
Interestingly, 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! According to an article from Medical News Today, 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. Plus, we pair them with onions, which are low in calories and also contain fiber and important nutrients.
Sautéing mushrooms and onions in butter does not overly saturate them, so they’re still a great source of your daily vegetable intake. Enjoy!
❄ Can you freeze mushrooms and onions?
Yes! You can freeze sautéed mushrooms and onions. After sautéing the dish, let it cool, then transfer to an air-tight container and freeze for up to three months. Make sure to label the container.
Reheating Frozen Mushrooms
To reheat, first let them thaw in the refrigerator. Then, reheat in a skillet with a few tablespoons of butter over medium heat, until the dish warms through. Serve, and enjoy!
🍲 What to Make with Mushrooms and Onions
Mushrooms and onions make a great side for a weekday dinner, but they’re perfect for special occasions like the holidays, too!
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!
In fact, this is one of our favorite Easy Christmas Dinner Ideas.
Mushrooms and onions make one of the best prime rib side dishes. You must try our easy mushroom and onion recipe with some of our favorite prime rib recipes!
- Slow Roasted Prime Rib Recipe
- Boneless Prime Rib Roast
- Standing Rib Roast
- Reverse Sear Instant Pot Prime Rib
- Or, serve them with leftover prime rib in our Creamy Penne Pasta with Prime Rib!
Sauteed mushrooms and onions for steak is the perfect pairing! Try topping some of our favorite grilled steak recipes with this onions and mushrooms recipe.
🥩 How to Reheat a Steak with Mushrooms
You can make our sautéed mushrooms and onions and add thinly sliced pieces of leftover steak. Heat for approximately 3-5 minutes. This combination is totally delicious!
🍄 Easy Mushroom Recipes
Love mushrooms? So do we! Try our other easy mushroom recipes.
If you like sauteing mushrooms and onions, you are going to love these recipes using mushrooms!
- Mushroom Grilled Cheese and French Onion Soup
- Vegetarian Stuffed Mushroom Recipe
- Instant Pot Risotto
- Vegetarian Stuffed Mushroom Recipe
- Air Fryer Mushrooms
- Hungarian Mushroom Soup
- Baked Portobello Mushrooms
- Chicken Breast and Mushroom Recipe
- Chicken and Mushroom Pie
- Chicken Tetrazzini
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Sautéed Mushrooms and Onions
- 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
- In a skillet, melt the butter over medium-high heat, then add the mushrooms and cook for 5 minutes.
- Next, reduce heat to medium, add the sliced onion, salt, pepper, and Worcestershire. Cook for another 5-7 minutes or until the mushrooms and onions are soft and browned. Serve warm.
- Don’t let the Mushrooms and Onions dry out! If the mushrooms and onions soak up too much of the juices, you can add additional Worcestershire sauce 1 teaspoon at a time.
- Do not replace the sweet yellow onion with white or red, you want to use only a sweet yellow onion for this dish.
- Variety of Mushrooms: We used white mushrooms in this recipe but, we also love using shiitake mushroom or baby portobello mushrooms if preferred.