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Easy Keto Cheese & Garlic Baked Portobello Mushroom Recipe

Baked Portobello Mushroom Recipe

Portobello mushrooms are one of the most versatile ingredients and they pack some serious nutritional punch. Whether you want a hearty vegetable side or a healthy entree meat substitute, this baked portobello mushroom recipe is a great option! Here we’re preparing them baked in the oven (aka roasted) with garlic and Italian cheese – and although they are quick and easy to prep and bake, these cheesy garlicky portobello mushrooms pack some serious flavor! They make a great keto friendly and gluten free side dish or entree!

Every time I make this baked portobello mushroom recipe my husband is surprised that they are good. It’s true, mushrooms can get a bad rap for boring but don’t discount roasted portobellos…I promise this preparation of mushrooms are not boring!

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Note: This baked portobello mushroom recipe uses dairy products, but you can adapt this recipe to fit more dietary needs.

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Paleo/Vegan Adaptations

You can omit the butter and use a dairy free cheese to make these roasted portobellos paleo and/or vegan compliant.


I tend to be a purist about my food, but some of you may be wondering what kind of modifications you can make to this roasted portobello mushroom recipe to add more flavor, variety or nutritional content. Portobello mushrooms lend themselves to a wide variety of preparations, and using this baked portobello recipe as a base, you can definitely experiment with these cheese and garlic portobellos in a lot of ways!

  • Try adding spinach or kale to pack in more nutrition
  • Try adding panko bread crumbs (or pork rind crumbs for Keto friends)
  • Put it on a burger bun with aioli for a garlic and cheese portobello mushroom burger
  • Cut it into smaller pieces and serve it as an appetizer
  • Add fresh mozzarella, basil and diced tomatoes for caprese stuffed portobellos

Fun Fact About Portobello Mushrooms

The portobello, white button, and cremini mushrooms are actually all the same mushroom! They are just in different stages of growth. Ever see a mushroom called “baby bellas” well those are just cremini mushrooms! True story…now you know!

Another Fun Fact About Portobello Mushrooms

One Portobello mushroom has a significantly higher concentration of potassium than a single banana!

Why Portobello Mushrooms?

Portobellos are not only low in calories, carbs, and sodium…they are 100% gluten-free. Portobello mushrooms also have a high mineral and B-vitamin content. They are a good source of Phosphorous, Potassium, Selenium, and Copper.

Baked Portobello Mushroom Recipe
Yield: 2 Mushroom Caps (serves 2-4)

Cheese & Garlic Roasted Portobello Mushrooms

Prep Time: 5 minutes
Cook Time: 20 minutes
Total Time: 25 minutes

These cheesy, garlicky roasted portobellos give portobello mushrooms a new lease on life in our house! The kids might even eat these! They are quick and easy, keto friendly, low carb and gluten free.


  • 2 Portobello Mushroom CapsĀ 
  • 1 Garlic Clove
  • 2 Teaspoons Olive Oil
  • Dash of Thyme
  • Salt & Pepper
  • 1 teaspoon of butter (split)
  • 1/4 Cup Shredded Italian Cheese Blend
  • Freshly Grated Parmesan Cheese (to taste)


  1. Gently wipe mushroom caps clean with a clean kitchen towel and remove stems
  2. Line baking sheet with parchment paper and place caps on sheet (insides facing up)
  3. Dice garlic
  4. Mix garlic, olive oil and a dash of thyme
  5. Split between the mushroom caps, top with butter and season with salt and pepper as desired
  6. Bake for 10 minutes
  7. Remove from oven and top each cap with Italian cheese blend and fresh grated parmesan to taste
  8. Bake again for 10 minutes. Broil for a minute if desired to brown cheese (optional).
  9. Enjoy!


Tip: If you use salted butter and parmesan cheese, you probably won't need to add salt in step 5

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 135Total Fat: 11gSaturated Fat: 5gTrans Fat: 0gUnsaturated Fat: 6gCholesterol: 21mgSodium: 261mgCarbohydrates: 3gNet Carbohydrates: 0gFiber: 1gSugar: 1gSugar Alcohols: 0gProtein: 6g

Nutrition information is auto generated and may not be accurate. Not responsible for errors or omissions.

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You might also like to serve this baked portobello mushroom recipe as a side to Maine Lobster or King Crab Legs. We suggest pairing with a cold glass of La Mura Organic White Wine or Conundrum White Wine.

All opinions expressed on CostContessa are our own. Product features and nutrition information provided on our site is provided to us by third parties, and we do not independently verify its accuracy. Consumers should verify all information. Our content is not intended as a substitute for medical counseling or reading packaging yourself. Please always see actual package information yourself (it can and does change!) and consult your doctor with all questions.

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