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    A Full Living » Recipes » Vegetables

    Published: Nov 27, 2022 · Modified: Mar 2, 2023 by Briana · This post may contain affiliate links.

    Caramelized Onions and Mushrooms

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    caramelized onions and mushrooms

    These Caramelized Mushrooms and Onions are full of sweet, earthy flavor, and are made with just a few ingredients. This simple recipe makes for a perfect side dish for a variety of main courses. Though it takes a few minutes from start to finish, the extra time is worth the wait!

    caramelized onions and mushrooms topped with fresh thyme in a bowl.

    If you love mushrooms and onions, and you need a versatile side dish, you will love this tasty topping.

    Use it on burgers, as the perfect topping for this air fryer ribeye or these air fryer short ribs, and more! It's absolutely packed with savory flavor, and a little bit of sweetness, what's not to love?

    Love mushrooms? Try this creamy keto mushroom sauce, this cauliflower and mushroom dish, this chicken bacon mushroom pasta, or these portobello mushroom burgers!

    Jump to:
    • ❤️Why we love this recipe
    • 🧅Ingredients
    • 📋Substitutions & variations
    • 📋Prep work
    • 📖Instructions
    • ✨Tips & tricks
    • 💭Frequently asked questions
    • More Recipes To Try
    • 🌟Leave a review!
    • 📖 Recipe
    • 💬 Community

    ❤️Why we love this recipe

    • Made with simple ingredients - Made with pantry staples and a few items, you likely have nearly everything on hand already. Anything you still need can be found at nearly any grocery store.
    • The perfect versatile side dish - Whether you're making a steak dinner, burgers, pork chops, lamb, or chicken, these tasty morsels will level up your next meal.
    • Easy recipe - All you need is a little bit of time to allow the caramelization process to take place, and make your mushrooms and onions incredibly tasty. Other than that, there's not much to this recipe.
    • Naturally gluten free - Made with whole foods, everything in this recipe is naturally gluten-free, so there's no need to worry.
    • Tons of rich flavor - The slow cooking process necessary for this recipe creates an incredible deep flavor as the mushrooms and onions release natural sugars and caramelize.

    🧅Ingredients

    Here are the ingredients you'll need for this recipe. Find the list of substitutions and variations below.

    ingredients to make caramelized onions and mushrooms laid out in bowls with text overlaying to denote each ingredient.
    • Sweet onions - We generally opt for yellow onions, or Vidalia onions, as they are the sweetest.
    • Mushrooms - We used a mixture of shiitake mushrooms (our favorite) and baby bella mushrooms. You can use baby bella or white button mushrooms, as these are commonly available and very tasty.
    • Garlic
    • Olive oil & unsalted butter - We like to use a mixture of both to help keep the mushrooms and onions from sticking to the pan. You can of course just use one or the other.
    • Kosher salt and black pepper
    • Chicken broth
    • Balsamic vinegar & Worcestershire sauce - Technically optional, but both items add a ton of flavor.
    • Honey - Optional, but honey adds a ton of flavor and brings out the natural sugars and sweetness in the onions.
    • Add fresh parsley or thyme to garnish (optional)

    Full quantities and nutritional information can be found in the recipe card.

    📋Substitutions & variations

    • Swap the deglazing liquid - You can use white wine, beef broth, or vegetable stock in place of chicken stock.
    • Low carb - Omit the honey.
    • Garlicky - Add lots of garlic!
    • Herbed - Add savory herbs like sage, more thyme, and rosemary for lots of herbaceous flavors.
    • Vegan - Swap the chicken broth for vegetable broth, use vegan butter instead of regular butter, use maple syrup instead of honey, and use soy sauce instead of Worcestershire sauce.
    • Spicy - Add red pepper flakes.
    • Swap red onions for yellow onions - If that's all you have on hand, red onions will work just fine!

    📋Prep work

    • Clean mushrooms with a damp towel or paper towel and wipe off any dirt.
    • Cut mushrooms and onions into thin slices, about ¼ inch thick.
    • Finely mince garlic.
    • Preheat a large skillet (a 12" inch or larger cast iron skillet or enameled cast iron skillet) over medium heat.

    📖Instructions

    Melt butter in the hot pan over low heat. Add olive oil and garlic. Cook until garlic is fragrant, about 1 minute, moving often to prevent burning. (Image 1)

    butter and olive oil melted in a skillet with garlic.

    Increase the temperature to medium heat. Add mushrooms and onions, and cook without touching them for about 5 minutes. (Image 2) After about 5 minutes, season with salt, pepper, and fresh thyme (optional). (Image 3)

    onions and mushrooms in a large skillet with a wooden spoon, and thyme nearby.
    mushrooms and onions cooked down in an enameled cast iron skillet with a wooden spoon.

    Add chicken broth, Worcestershire sauce, balsamic vinegar, and honey to deglaze the pan. Toss to combine, and scrape the bottom of the pan to scrape up any browned bits. Increase to medium-high heat. (Image 4)

    mushrooms and onions in a pan with liquids.

    Stir every 5 minutes or so until there is no excess liquid in the pan and the mushrooms and onions have nice browned edges and everything is golden brown. This will take roughly 40-50 minutes. (Image 5)

    caramelized onions and mushrooms in an enameled cast iron skillet.

    ✨Pro tip - Cooking time will vary a little, as it truly depends on how long it takes for the liquid in the pan to evaporate.

    That's it! Serve and enjoy! We love to eat it with this air fryer ribeye.

    caramelized onions and mushrooms overtop of a perfectly cooked steak.

    ✨Tips & tricks

    • Don't overcrowd the pan. Use a large skillet to make sure the ingredients make as much contact with the pan as possible. This will encourage caramelization. The mushrooms and onions will release water, however, so they will end up taking up less room than at the beginning of cooking!
    • Don't cover the pan. This will cause the vegetables to steam, rather than caramelize and you won't get a nice crispy edge.
    • Don't burn the garlic. If you burn the garlic, you have to start over, as it will add a bitter taste to the dish.
    • Patience is key. The key to this recipe is time! There simply just isn't the option to rush it. The long cooking time creates amazing caramelization in the pan.

    Need supplies? Shop our Amazon store! Stock your pantry, and find all of our favorite kitchen tools! A Full Living LLC earns a small commission through purchases on our storefront to help support this site.

    💭Frequently asked questions

    How to store the leftovers:


    Store leftovers in an airtight container in the fridge for up to 5 days. Reheat gently in the microwave or on the stovetop in a skillet with a bit of broth or water.

    To freeze, allow the mushrooms and onions to cool at room temperature, then transfer to a freezer safe bag. Store in the freezer for 2-3 months. Thaw overnight in the fridge.

    More Recipes To Try

    • keto mushroom sauce
      Keto Mushroom Sauce Recipe
    • chicken bacon mushroom pasta with spinach
      Chicken Bacon Mushroom Pasta with Spinach
    • keto green bean casserole
      Keto Green Bean Casserole
    • spoonful of cauliflower mushroom side in a cast iron skillet
      Cauliflower Mushroom Recipe with Garlic Lemon Butter

    🌟Leave a review!

    Did you try this recipe? Make sure to leave a 5-star review below! 🌟 This helps other readers find our recipes and encourages them to try them. Also, be sure to leave a comment with your experience. Follow along, and tag @AFullLiving on Instagram with your photos!

    📖 Recipe

    caramelized onions and mushrooms

    Caramelized Onions and Mushrooms

    Briana
    These caramelized onions and mushrooms are the perfect side for a variety of dishes! Made with pantry staples, they're easy to make with just a bit of patience!
    5 from 2 votes
    Print Recipe Pin Recipe
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    Prep Time 10 minutes mins
    Cook Time 55 minutes mins
    Total Time 1 hour hr 5 minutes mins
    Course Side Dish, Sides
    Cuisine American
    Servings 8 servings
    Calories 135 kcal

    Equipment

    • 1 enameled cast iron skillet (can use any skillet)
    • wooden spoon
    • 1 sharp chef's knife

    Ingredients
      

    • 4 tablespoons unsalted butter
    • 2 tablespoons olive oil
    • 6 cloves garlic, minced
    • 16 ounces mushrooms, sliced (we used a mixture of baby Bella and shiitake)
    • 4 medium yellow onions, thinly sliced
    • 2 teaspoons kosher salt (to taste, added gradually)
    • 2 teaspoons thyme, fresh (could use 1 teaspoon of dried)
    • ½ teaspoon coarse black pepper (or to taste)
    • 1 tablespoon honey (to taste)
    • 2 tablespoons Worcestershire sauce
    • 2 tablespoons balsamic vinegar
    • 4 ounces chicken broth (½ cup, could use white wine, beef, or vegetable broth)

    Instructions
     

    • Add butter and olive oil to a dutch oven to melt over low heat. Once melted, add garlic and saute until fragrant, about 1 minute.
    • Increase to medium heat. Add in onions and mushrooms. Allow to cook down for about 5 minutes, and don't touch them at this time.
    • Season with salt, pepper, and thyme. Increase the heat to medium-high. Add in the Worcestershire sauce, honey, balsamic vinegar, and chicken broth. Toss to combine again, and stir every 5 minutes or so until there is no excess liquid in the pan and the mushrooms and onions have nice browned edges. This will take 45-50 minutes. Adjust seasonings to taste, and enjoy!
    • Store in an airtight container in the fridge for up to 5 days.

    Notes

    • Make sure mushrooms are dried really well before cooking, as mushrooms are very absorbent and excess water will make it harder to achieve a nice golden brown crust. 
    • We do recommend using yellow or Vidalia onions for the sweetest flavor. Red onions can be used but they will give a slightly more bitter flavor. 
    • Chicken broth can also be substituted with beef broth (for a beefier flavor to accompany beef dishes), vegetable broth for vegetarians, or even white wine. 
    • Sweeten to taste. Vidalia onions (if used) are particularly sweet, so you may require less honey. 

    Nutrition

    Calories: 135kcalCarbohydrates: 12gProtein: 3gFat: 9gSaturated Fat: 4gPolyunsaturated Fat: 1gMonounsaturated Fat: 4gTrans Fat: 0.2gCholesterol: 15mgSodium: 697mgPotassium: 319mgFiber: 2gSugar: 7gVitamin A: 204IUVitamin C: 7mgCalcium: 29mgIron: 1mg
    Tried this recipe?Leave a comment below and tag @AFullLiving on social!
    « Keto Pumpkin Spice Latte
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    Reader Interactions

    Comments

    1. Sarah S. says

      March 26, 2023 at 5:54 pm

      5 stars
      I have never left a review on any recipe. But my husband got a hankering for a big steak and wanted some onions and mushrooms to go with it. As I do not eat steak and HATE both onions and mushrooms I looked at a few dozen recipes to try. I halved the recipe and used a 14" skillet, so I added another 1/4 c chicken stock as the moisture evaporated after about 20 minutes. But I gave my husband a bite to try and he said 🤌 (hand gesture and all!) This will now be the only recipe I have ever and will ever use for mushrooms and onions!!

      Reply
      • Briana says

        March 26, 2023 at 7:55 pm

        Hey Sarah, this is so awesome to hear!! We're seriously so thrilled y'all enjoyed these so much, and we're so honored to have this become a regular on yur table!

        Reply

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