These grilled portobello mushrooms are smoky, savory, and packed with bold flavor. Tender mushroom caps make a delish low carb side, juicy burger swap, or easy meatless dinner in just 30 minutes.

Holly’s Recipe Highlights
- Flavor: Smoky and savory, with bold garlic, light heat, and a sesame ginger finish.
- Skill Level: This beginner friendly recipe comes together quickly with an easy method.
- Tools: A grill or grill pan, a bowl or freezer bag for marinating, keeps prep easy and organized.
- Budget: Portobello mushrooms on the grill make a budget friendly option that’s low in carbs yet still hearty, satisfying, and filling.
- Serving: Serve 4 whole mushroom as a meatless burger alternative, or slice up 8 small mushrooms for an easy burger topping or savory side dish.

Ingredient Notes
- Portobellos: Pick large, firm mushroom caps with smooth tops and dry gills. Creminis, which are younger portobellos, can be used just be aware they may cook more quickly.
- Marinade: Easy to make and can be used on grilled vegetables too!
- Olive oil: Keeps mushrooms from sticking on the grill and helps them brown nicely.
- Soy sauce: Choose a low sodium option to add salty, savory depth and umami flavor. Use tamari for gluten free or coconut aminos for a soy free option.
- Sesame oil: A small amount adds a delicious nutty flavor. Use toasted sesame oil for a more bold taste.
- Garlic: Fresh minced garlic adds a subtle flavor punch. You can sub garlic powder which blends well into the marinade but does not bring the same flavor as fresh.
- Fresh ginger: Adds warm, fresh, zesty warmth. Ginger paste makes a great shortcut.
- Chili flakes: While optional, they add a little heat and a bit of smoky spice, giving the marinade a nice kick without making it too spicy.
- Salt: Taste the marinade first before adding.
Variations
- Sweet and Tangy: Swap sesame oil and ginger for balsamic vinegar and Italian seasoning.
- Bright and Fresh: Use lemon juice, parsley, and a pinch of oregano for a brighter flavor.
- Extra Spicy: Add a little sriracha or more chili flakes to the marinade.
- Kid Friendly: Skip the chili flakes for a gentler, family friendly version with all the flavor and none of the heat.
- Make it Cheesy: Add mozzarella or parmesan during the last minute of grilling.
- Simple Yet Delish: Brush the grilled mushroom with melted butter and grate some black pepper on top.


How to Make Grilled Portobello Mushrooms
- In a bowl, whisk the marinade ingredients (full recipe below).
- Prep mushrooms and add to the marinade.
- Grill portobellos gill side down until lightly charred, flipping halfway through.

Leftovers Made Easy
- Refrigerate leftover grilled portobello mushrooms in an airtight container for up to 4 days.
- Slice leftover mushrooms and add them to salads, omelets, lettuce wraps, cauliflower rice bowls, or grilled chicken and steak.
- You can reheat mushrooms in a skillet, on the grill, or in the air fryer until warmed through.
- Freeze leftovers in a freezer safe bag or container for up to 2 months. The texture will be soft, so they are best chopped and added to stir frys, soups, casseroles, omelets, or cauliflower rice bowls.
Mushroom Lovers Low Carb Picks
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Grilled Portobello Mushrooms
Equipment
Ingredients
- 4 large portobello mushrooms or 8 small portobello mushrooms
- 2 tablespoons olive oil
- 2 tablespoons soy sauce
- 1 teaspoon sesame oil
- 1 clove garlic minced
- 1 teaspoon minced fresh ginger
- ¼ teaspoon chili flakes
- salt to taste
Instructions
- Wipe the mushrooms clean with a damp paper towel and remove the stems. Using a sharp knife, cut a few shallow cuts across the surface of the tops of the mushrooms (just enough to allow the marinade to get into the mushroom).
- In a glass bowl or freezer bag, mix olive oil, soy sauce, sesame oil, garlic, ginger, and chili flakes. Toss the mushrooms to coat and marinate for 15 to 60 minutes.
- Preheat the grill to medium-high heat.
- Place the mushrooms, stem side down on the grill and cook for 5 to 6 minutes. Flip the mushrooms over and cook for an additional 4 to 5 minutes or until tender.
Notes
- The longer you marinate the portobellos, the deeper the flavor will get.
- Keep leftovers in an airtight container in the refrigerator for up to 4 days.
Nutrition Information
Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.
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