Caramelized Mushrooms and Onions

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5 from 2 votes
Prep: 5 minutes
Cook: 30 minutes
Total: 35 minutes

Caramelized Mushrooms and Onions are such a versatile side dish. Enjoy this easy dish on its own or as a topping to burgers, steaks, or sandwiches!

A white dish of the mushrooms and onions.

These Sauteed Mushrooms and Onions a pack huge flavor, can easily able to level up any dish. Caramelized Mushrooms and Onions can be achieved in a few steps with a few simple ingredients, this recipe is fool proof!

To learn more about Onions and Mushrooms, visit the USDA links to learn more!


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What We Love About This Simple Recipe

  • Easy Ingredients: This dish only requires 4 easy ingredients!
  • Adaptable: You can add these sauteed mushrooms and onions to finish off any dish that needs that savory flavor.
  • Makes Great Leftovers: You can repurpose these left overs for any side dishes to add to sandwiches, hot dogs, or burgers!
A top shot of xRmwlized mushroom and onions.

Ingredient Notes for Delicious Sauteed Mushrooms

  • Onions: White onions or yellow onions will work and are a great addition to any meal, especially vegan dishes.
  • Mushrooms: Baby bella mushrooms, portobello, white, oyster mushrooms, wild mushrooms, or any mushroom of your choice will work.
  • Butter: You will need 3 tablespoons of butter for this recipe as it will help in the caramelization process. Salted or unsalted butter will both work.
  • All Purpose Seasoning Blend: For this recipe, you can use a pre-made seasoning mix or you can make your own blend with this recipe!
Bowls of onions, mushrooms, butter and garlic.

Equipment Needed for Easy Side Dish

How to Saute Onions and Mushrooms

These are the basic steps for making Caramelized Onion and Mushrooms. Please refer to the recipe card below for more detailed instructions.

A pan of the onion and mushroom mixture.

STEP 1: CHOP UP ONIONS AND MUSHROOMS

Start by cutting up the onions and mushrooms into medium-thin slices. Make sure to clean mushrooms prior to slicing to remove any dirt.

STEP 2: SAUTEING MUSHROOMS AND ONIONS

Heat butter in large hot pan, then add the sliced mushroom and onions, along with the all purpose seasoning making sure everything is evenly coated. Cook for 30 minutes, stir occasionally.

STEP 3: COOK UNTIL GOLDEN

You will know you the onions and mushrooms caramelized successfully when they are a golden brown with little brown bits and smell sweet is the full recipe cooking time. Remove from heat and serve. Use these mushrooms and onions for steak or burgers!

Prep and Storage Tips for this Perfect Side Dish

HOW TO MAKE THIS RECIPE AHEAD OF TIME

To prepare this recipe you can slice up the onions and mushrooms ahead of time and keep in an airtight container or plastic bag in the fridge 1-3 days prior.

HOW TO STORE THIS RECIPE

Store leftover sauteed onions and mushrooms in airtight container for 3-4 days.

HOW TO FREEZE THIS RECIPE

To freeze sauteed mushroom and onions, store in a freezer-safe bag for up to 1 year.

HOW TO REHEAT THIS RECIPE

If you are reheating from the fridge, you can sauté onions over low heat on the stove top to microwave for 1-2 minutes until hot. If you are taking from the freezer, make sure you allow the caramelized mushrooms and onions to thaw in the fridge overnight.

Frequently Asked Questions about Sauteed Mushrooms and Onions

HOW LONG DOES IT TAKE TO CARAMELIZE THE ONIONS?

For this recipe, it take 30 minutes to caramelize the mushrooms and onions.

CAN I SUBSTITUTE SWEET ONIONS IN PLACE OF WHITE ONIONS?

You can also use sweet onions for even sweeter caramelized onion.

CAN THIS RECIPE BE DOUBLED OR HALVED?

This mushroom and onion recipe can easily be doubled or halved, just increase or decrease the ingredients proportionally.

CAN YOU CARAMELIZE MUSHROOMS WITH ONIONS?

Yes, you can easily make caramelized mushroom and onions together with few ingredients.

A close up on the mixture.

Expert Tips for Making This Recipes with Onions and Mushrooms

  • This Recipe Can be Doubled: This is a great recipe for a crowd.  Simply increase the ingredients proportionately and split it into two baking dishes before baking.
  • Instant Pot: You can also make this recipe using an instant pot for quicker results. First cook the mushroom and onions on the pressure cook setting for 5 minutes. Then drain excess liquid and saute for an additional 3-5 minutes.
  • Quicker Prep Time: To reduce prep time, you can get pre-sliced mushrooms and onions or cut up ahead of time and store in the fridge.
  • Wine: Red Wine or White Wine adds to your favorite dishes.
  • Fresh Herbs: Fresh Parsley, thyme, black pepper or whatever you need.

What to Serve with Caramelized Onions and Mushrooms

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A white dish of the mushrooms and onions.
5 from 2 votes

Caramelized Mushrooms and Onions

Yield: 8 servings
Prep: 5 minutes
Cook: 30 minutes
Total: 35 minutes
Caramelized Onions and Mushrooms are so versatile. Enjoy them as a side dish or as a topping to burgers, steaks, and sandwiches!
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Ingredients

  • 3 tablespoons butter
  • 2 pounds white onions, peeled and sliced thin
  • 8 oz sliced mushrooms
  • 1/2 teaspoon All Purpose Seasoning Blend

Instructions

  • Melt butter in a large skillet oven medium-low heat.
  • Add onions, mushroom and All Purpose Seasoning to the skillet and toss to combine.
  • Cook over medium-low heat for 30 minutes, stirring occasionally.
  • When onions and mushrooms are golden, remove from heat and serve immediately.

Expert Tips

 
  • This Recipe Can be Doubled: This is a great recipe for a crowd.  Simply increase the ingredients proportionately and split it into two baking dishes before baking.
  • Instant Pot: You can also make this recipe using an instant pot for quicker results. First cook the mushroom and onions on the pressure cook setting for 5 minutes. Then drain excess liquid and saute for an additional 3-5 minutes.
  • Quicker Prep Time: To reduce prep time, you can get pre-sliced mushrooms and onions or cut up ahead of time and store in the fridge.
  • Wine: Red Wine or White Wine adds to your favorite dishes.
  • Fresh Herbs: Fresh Parsley, thyme, black pepper or whatever you need.

Estimated Nutritional Information

Calories: 90kcal | Carbohydrates: 12g | Protein: 2g | Fat: 4g | Saturated Fat: 3g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 1g | Trans Fat: 1g | Cholesterol: 11mg | Sodium: 40mg | Potassium: 261mg | Fiber: 2g | Sugar: 5g | Vitamin A: 139IU | Vitamin C: 9mg | Calcium: 33mg | Iron: 1mg
The nutritional information provided are estimates. To learn more about how I calculate this information go to www.itisakeeper.com/about-its-a-keeper/privacy-disclosure-policies/
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Course: Side Dish
Cuisine: American
Keyword: all purpose seasoning, butter, caramelized onions, mushrooms, onions, side dish

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