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    Home » Diabetes Diet

    Oven Portobello Mushrooms and Onions

    Published: Jun 27, 2020 • Modified: Jun 27, 2020 by Charlotte• This post may contain affiliate links •3 Comments

    745 shares
    Jump to Recipe - Print Recipe
    roasted mushrooms and onions on plate

    Oven roasted portobello mushrooms and onions are the perfect addition to tacos, pizza, wraps and salads. Balsamic vinegar adds a flavor boost you will love! So easy- the veggies roast in the oven while you prep your meal.

    cooked mushrooms and onions on white plate

    This recipe originally published February 2014, now updated with new photos, step by step instructions and pro tips.

    These oven roasted onions and mushrooms are so versatile! I like to roast a batch when I have time and then store them in the refrigerator to use throughout the week. Mushrooms and onions add tons of flavor to entrees, vegetables and snacks. These are also delicious added to tacos and as a pizza topping.

    Jump to:
    • Why this recipe works
    • Ingredients
    • Instructions
    • Expert tips
    • Recipe
    • Comments
    roasted sliced onions and mushrooms

    Roasting the mushrooms and onions with a splash of balsamic vinegar kicks the flavor up and makes these veggies perfect add ons to just about any recipe. Check out my Low Carb Steak Taco Bowl, Low Carb Mediterranean Chicken and Low Carb Fajita Lettuce Wrap for more ways to use roasted veggies.

    Why this recipe works

    • We are using a tasty combo of onions and mushrooms to add umami to almost any recipe we pair this with.
    • A lower oven temp and longer roasting time just adds to the flavor.
    • A great make ahead recipe.
    roasted mushrooms and onions

    Ingredients

    • Onions- I used yellow onions but others can be used such as Vidalia, white or sweet onions.
    • Mushrooms- You may use portobello or white varieties.
    • Olive oil
    • Balsamic Vinegar- choose your favorite brand
    • Seasonings

    Instructions

    • Step 1: Add sliced onions and portobello mushrooms to a medium sized bowl.
    • Step 2: Add remaining ingredients and stir to combine.
    • Step 3: Roast in oven until tender and browned.
    chopped onions and mushrooms in bowl
    Step 1
    sliced onions and mushrooms with olive oil
    Step 2
    roasted sliced onions and mushrooms
    Step 3

    Expert tips

    • Buy pre-sliced onions and baby bellas for convenience if desired.
    • Use a foil-lined pan for easier clean up.
    • Store in refrigerator up to 3 days.
    roasted mushrooms and onions on white plate

    Looking for more low carb recipe ideas? Check out my Low Carb Cheesesteak Stuffed Mushrooms, Low Carb Tomato Mushroom Pizza and Spinach Artichoke Dip!

    Did you make this recipe? Be sure to leave your star rating below!

    Recipe

    roasted sliced onions and mushrooms

    Oven Portobello Mushrooms and Onions

    Oven roasted portobello mushrooms and onions are the perfect addition to tacos, pizza, wraps and salads. Balsamic vinegar adds a flavor boost you will love! So easy- the veggies roast in the oven while you prep your meal.
    4.47 from 32 votes
    Print Pin Rate
    Course: Side Dish
    Cuisine: American
    Diet: Diabetic, Low Calorie, Low Lactose, Vegetarian
    Prep Time: 10 minutes minutes
    Cook Time: 45 minutes minutes
    Total Time: 55 minutes minutes
    Servings: 4
    Calories: 104kcal
    Author: Easyhealth Living

    Ingredients

    • 2 medium Onions sliced
    • 8 oz Mushrooms, portobello , sliced
    • 2 Tablespoons Olive Oil
    • 2 Tablespoons Balsamic Vinegar
    • ½ Teaspoon Thyme
    • ½ Teaspoon Black Pepper
    • ¼ Teaspoon Sea Salt
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    Instructions

    • Preheat oven to 375 degrees.
    • Line a large baking sheet with foil and coat with nonstick spray. Set aside.
    • In a large bowl, combine all ingredients, mixing well.
    • Spread evenly onto baking sheet.
    • Roast in oven for 45 minutes or until roasted and tender, stirring halfway through baking time.
    • Use immediately or store in refrigerator for use later.

    Notes

    Expert Tips
    • Buy pre-sliced onions and mushrooms for convenience if desired.
    • Use a foil-lined pan for easier clean up.
    • Store in refrigerator up to 3 days.
     
    Nutrition Facts
    Oven Portobello Mushrooms and Onions
    Amount per Serving
    Calories
     
    104
    Calories from Fat 63
    % Daily Value*
    Fat
     
    7
    g
    11
    %
    Saturated Fat
     
    1
    g
    5
    %
    Polyunsaturated Fat
     
    1
    g
    Monounsaturated Fat
     
    5
    g
    Sodium
     
    152
    mg
    6
    %
    Potassium
     
    275
    mg
    8
    %
    Carbohydrates
     
    9
    g
    3
    %
    Fiber
     
    2
    g
    8
    %
    Sugar
     
    5
    g
    6
    %
    Protein
     
    2
    g
    4
    %
    Vitamin A
     
    14
    IU
    0
    %
    Vitamin C
     
    6
    mg
    7
    %
    Calcium
     
    19
    mg
    2
    %
    Iron
     
    1
    mg
    6
    %
    * Percent Daily Values are based on a 2000 calorie diet.
    Tried this Recipe? Pin it for Later!Mention @EasyHealthllc or tag #EasyHealthllc!

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    745 shares

    Reader Interactions

    Comments

    1. Luisa Fijman

      June 27, 2021 at 12:49 pm

      5 stars
      Very easy and flavorful. Full of nutrients.

      Reply
    2. Danielle

      April 12, 2023 at 9:46 pm

      I’m doing the HCG diet and need recipes without oil. Do you have any suggestions? I love mushrooms and onions so I would love to be able to incorporate this recipe somehow without oil. Any suggestions?

      Reply
      • Charlotte

        April 20, 2023 at 2:52 pm

        Maybe try cooking in a non stick pan on low heat and cover the pan to retain moisture. Hope that helps!

        Reply

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