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    Home » Recipes » Sides

    Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms

    Willow Moon in front of bushes.
    Updated: Oct 21, 2025 · by Willow Moon · This post may contain affiliate links · As an Amazon Associate I earn from qualifying purchases. · I get commissions for purchases made through links in this post.
    Jump to Recipe Pin Video

    This Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms is the side dish you want on your holiday menu! It feels indulgent, yet it is healthy!

    Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms close up with fork on cutting board.

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    ⭐️⭐️⭐️⭐️⭐️

    "The combination of the mashed cauliflower with the onions and mushrooms is SO good! It makes the mashed cauliflower more pleasurable! - Francine"

    I made this Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms because I am all about healthy swaps. Whenever I can swap out a starchy vegetable or a processed grain, I am all over it.

    I've been known to make wraps with nori seaweed or green lettuce. I love to make noodles out of zucchini, carrots, sweet potato, and cucumber.

    Whenever a recipe calls for vegan mashed potatoes or rice, I replace them with cauliflower.

    This is the perfect Thanksgiving side. It is healthy, yet you feel like you are indulging. Sweet caramelized onions and mushrooms elevate creamy mashed cauliflower to another level.

    This dish isn't as heavy as mashed potatoes, so you will still have room for dessert!

    I prefer multicultural cuisine for the holidays and in general. I've been known to eat Vegan Zucchini Lasagna with Tofu Ricotta and Walnut Sauce or Tofu Enchiladas on Christmas.

    I do like a healthy swap though, and since I am a food blogger, I thought I should include some traditional recipes like this one and my Roasted Brussels Sprouts and Apples with Tahini Dressing.

    Other recipes to try are my Frozen Stir Fry Meal, Vegan Mashed Cauliflower recipe, and Onion Fritter recipe.

    Jump to:
    • ❤️ Why You'll Love It
    • 🧾 Ingredients
    • 🔪 Instructions
    • 🍽 Serving
    • 👩🏻‍🍳 Recipe FAQs
    • Other Healthy Swaps
    • 🎥  Video
    • 📋 Recipe
    • 💬 Comments

    ❤️ Why You'll Love It

    • It is healthy and flavorful.
    • It's the perfect side dish for the holidays.
    • Caramelized onions and mushrooms elevate mashed cauliflower to another level.

    🧾 Ingredients

    Ingredients on a cutting board with labels.
    • Cauliflower: You could use fresh or frozen cauliflower.
    • Olive oil: For the mashed cauliflower, you could also use vegan butter, like Earth Balance.
    • Almond milk: I  used unsweetened plain almond milk. You could use any plain dairy-free milk.
    • Onion: A sweet onion, yellow onion, or white onion all will work. Although I prefer a sweet onion or yellow onion.
    • Salt and pepper: Enhances flavors and adds flavors.
    • Balsamic vinegar: Adds sweetness. You could also add a pinch of sugar or brown sugar, which I've been known to do when I don't have balsamic vinegar.
    • Mushrooms: I used baby portobello mushrooms. You could use your favorite mushrooms.

    To see the full list of ingredients with measurements and instructions, see the recipe card at the bottom of this post.

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    🔪 Instructions

    Collage photo of cauliflower being steamed, then added to a food processor, then mixed, and last sliced onions in a skillet.

    Step 1: Steam cauliflower, then let it cool.

    Step 2: Add cauliflower, almond milk, olive oil or vegan butter, and salt and pepper to a food processor. Set aside.

    Step 3: Blend until creamy.

    Step 4: Add olive oil and onions to a skillet. Heat on medium-low.

    Collage photo of caramelized onions in a pan, then balsamic vinegar added, then mushrooms added, and lastly cooked.

    Step 5: Cook for about 35-40 minutes.

    Step 6: Pour a splash of balsamic vinegar to deglaze the pan.

    Step 7: Add mushrooms.

    Step 8: Cook a few minutes more. Reheat mashed cauliflower and top with caramelized onions and mushrooms.

    Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms in a small bowl.

    🍽 Serving

    • Vegan Tahini Noodles
    • Vegan Lentil Loaf
    • Vegan BBQ Jackfruit Sandwich
    • Vegan Spinach Lasagna
    Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms close up with fork on cutting board.

    👩🏻‍🍳 Recipe FAQs

    Why is my cauliflower mash grainy?

    You probably didn't cook it long enough. Make sure the steamed cauliflower is fork-tender.

    Is cauliflower a good substitute for potatoes?

    Mashed cauliflower makes an excellent substitute for mashed potatoes. It becomes creamy when blended with olive oil or vegan butter and almond milk.

    Other Healthy Swaps

    • Maple Chipotle Black Bean Lettuce Wraps with Mango Salsa
      Maple Chipotle Black Bean Lettuce Wraps with Mango Salsa
    • Lentil and Mushroom Shepherd's Pie with Mashed Cauliflower on a plate with fork.
      Lentil and Mushroom Shepherd's Pie with Mashed Cauliflower
    • Bean and Mexican Cauliflower Rice Burrito on a cutting board.
      Bean and Mexican Cauliflower Rice Burritos
    • Black Bean Hummus Collard Wrap
      Black Bean Hummus Collard Wrap

    🎥  Video

    If you tried this Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms Recipe or any other recipe on my website, please leave a ⭐️ star rating and let me know how you like it in the 💬 comments below. I love hearing from you!

    Whether you are cutting back on carbs or want to add more veggies to your repertoire, this mashed cauliflower recipe is for you. Caramelized onions and portobello mushrooms add a rich touch. Perfect for a Thanksgiving side.

    📋 Recipe

    Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms close up with fork on cutting board.
    Pin Print
    4.80 from 5 votes

    Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms

    This Vegan Mashed Cauliflower with Caramelized Onions and Mushrooms is the side dish you want on your holiday menu! It feels indulgent, yet it is healthy!
    Course Side Dish
    Cuisine American
    Diet Gluten Free, Vegan, Vegetarian
    Prep Time 5 minutes minutes
    Cook Time 55 minutes minutes
    Total Time 1 hour hour
    Servings 4
    Calories 56kcal
    Author Willow Moon
    Prevent your screen from going dark

    Equipment

    • food processor

    Ingredients

    • 1 head cauliflower chopped (2 cups)
    • 1 tablespoon olive oil or Earth Balance
    • 6 tablespoons unsweetened plain almond milk
    • 1 onion sliced (2 cups)
    • Salt and pepper
    • Slash balsamic vinegar
    • 1 cup sliced baby portobello mushrooms
    US Customary - Metric

    Instructions

    • Steam cauliflower. Set aside until cool. Mix in food processor with almond milk,  salt, pepper, and olive oil or Earth Balance.
    • Heat olive oil in a pan at medium low heat and add sliced onions. Stir the onions until they are coated with oil. Sprinkle a pinch of salt on the onions.
    • Stir the onions every few minutes or so. Cooking will take about 35-40 minutes. Add balsamic vinegar to deglaze the pan. Add sliced mushroom, and cook a few minutes more.
    • Reheat mashed cauliflower on stovetop or in microwave. Top with caramelized onions and mushrooms.
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    Nutrition

    Calories: 56kcal | Carbohydrates: 4g | Protein: 1g | Fat: 3g | Saturated Fat: 0g | Cholesterol: 0mg | Sodium: 40mg | Potassium: 198mg | Fiber: 1g | Sugar: 2g | Vitamin C: 14.9mg | Calcium: 39mg | Iron: 0.2mg

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    *Note: Nutrition information should be considered an estimate only. Different nutrition calculators give you different results.

    More Sides

    • Mexican Cauliflower Rice in a bowl with lime wedges.
      Mexican Cauliflower Rice
    • Vegan Mashed Potato Pancakes on a plate with a fork.
      Best Vegan Mashed Potato Pancakes
    • Red Lentil Pasta Salad with Chickpeas in a wood bowl.
      Red Lentil Pasta Salad with Chickpeas
    • Vegan Sweet Potato Salad in a bowl.
      Vegan Sweet Potato Salad

    Reader Interactions

    Comments

      4.80 from 5 votes (2 ratings without comment)

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      Recipe Rating




    1. K P VASUDEVA RAO says

      April 05, 2023 at 6:03 pm

      Hi, namaste,
      I am from India, and I thoroughly enjoyed reading about this delicious dish. You have mentioned in the nutritional information that the dish has 56 calories. Is this value of all the four servings or only one serving?
      Kindly let me know.
      Adios.5 stars

      Reply
      • Willow Moon says

        April 05, 2023 at 6:05 pm

        That's for one serving.

        Reply
    2. Katelyn says

      November 17, 2018 at 12:07 pm

      Made this today and it was a total hit! I served it with spinach I had sauteed with a bit of red pepper flake, minced garlic, salt, and lemon and we made this "side" our main course. I added vegan Parmesan to the cauliflower mash, but I think it would be good without it. This will definitely be placed in regular rotation in our house! Thank you for sharing.5 stars

      Reply
      • Willow Moon says

        November 17, 2018 at 4:10 pm

        Thanks Katelyn! I'm so glad that you like it! I'm going to have to try the sauteed spinach. I have done it with garlic and olive oil, but I love the addition of lemon juice and red pepper flakes!

        Reply
    3. Francine says

      April 10, 2018 at 2:57 pm

      The combination of the mashed cauliflower with the onions and mushrooms is SO good! It makes the mashed cauliflower more pleasurable!5 stars

      Reply
      • Willow Moon says

        April 10, 2018 at 3:11 pm

        Thanks Francine, I'm so glad that you like it!

        Reply
    4. Ashley says

      February 09, 2018 at 11:01 am

      Yes love this healthy swap! Looks so good. ❤️

      Reply
      • Willow Moon says

        February 10, 2018 at 10:51 am

        Thanks Ashley!

        Reply
    « Older Comments

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