Go Back
+ servings
several pieces of grilled mushroom steak topped with sauce and herbs.
Print SAVE Pin
5 from 2 votes

Mushroom Steak

This Mushroom Steak is made with portobello mushrooms marinated and then grilled indoors or outdoors until tender and nicely browned. They are ready in 30 minutes, making the perfect vegan, low-carb dinner meal for busy weeknights.
Course:Main dish
Prep Time 20 minutes
Cook Time 10 minutes
Total Time 30 minutes
Servings 4
Calories97.1 kcal
Cost $ 1.00 per person


  • 4 large portobello mushrooms

For the Marinade:

  • 3 tablespoons No sugar added balsamic vinegar or regular if not on a keto diet
  • 3 tablespoons keto soy sauce or regular or gluten-free if not on a keto diet
  • 2 tablespoons extra virgin olive oil or vegetable oil
  • 1 tablespoon Worcestershire sauce optional – choose a vegan one if you’re on a vegan diet
  • 1 teaspoon smoked paprika
  • ¾ teaspoon garlic powder avoid minced fresh garlic because it can easily burn
  • salt and fresh cracked pepper to taste


  • CLEAN AND TRIM THE MUSHROOMS: Use a damp paper towel or a soft brush to gently clean any dirt off the surface of the mushrooms. Do NOT wash them! Then, trim them by cutting off the stems and using a spoon to scoop out the brown gills.
  • PREPARE THE MARINADE: In a large, shallow baking dish, whisk all the marinade ingredients together (balsamic vinegar, soy sauce, olive oil, Worcestershire sauce, smoked paprika, garlic powder, salt and pepper). Taste and add more seasonings if you want (NOTE: the flavors will be concentrated).
  • MARINADE THE MUSHROOMS: Add the mushrooms to the marinade and brush the marinade on all sides very well. Let it sit for 10-20 minutes, flipping and brushing again midway through this time.
  • COOK: Heat a large grill pan or cast-iron skillet over medium-high heat until it gets sizzling hot. Then brush the bottom of the pan with oil and place the mushrooms onto it. Using a spatula, press them down gently and let them be seared for 4-5 minutes, without moving them.
  • Then, flip them over and sear the other side. Add more oil if needed, or brush on more marinade. Cook them until browned and tender, about 4-5 minutes. Enjoy them between keto buns, or with steamed or grilled veggies! TIP: Don't overcrowd the pan; or your mushrooms will steam instead of searing.
  • ALTERNATIVE METHOD: If cooking on an ELECTRIC GRILL, preheat the grill over medium-high heat, at 350 to 400º F (177 to 204ºC). Clean the grill and grease the cooking grates with oil. Remove the mushrooms from the marinade, then place it on the hot grill, cap-side down. Cover and grill them for 4 to 6 minutes. Flip and then cook them covered for an additional 3 to 5 minutes.

Recipe Notes

Useful Tips
Do NOT wash your mushrooms. They are like sponges and will absorb a lot of water, making them soggy.
Heat your pan or grill very well; otherwise, your mushrooms won’t sear properly!
Don't overcrowd the pan, or your mushrooms will steam instead of searing.
How to Store
Uncooked: Wrap portobello mushrooms in paper towels and then place them in open plastic bags (or paper bags which are even better) and keep them in the fridge for 5-7 days.
Cooked: Store mushroom steak leftovers in an airtight container in the fridge for up to 2-3 days. Avoid freezing because leftovers can become soggy after thawing. But if you need to, pat them dry with a paper towel, spread them out on a baking sheet lined with parchment paper, and freeze them until firm.
Then transfer them to a Ziploc bag and seal them in. Keep them frozen for up to a month but be aware portobello steak won't be as firm after thawing.


Calories: 97.1kcal | Carbohydrates: 5.5g | Protein: 3.4g | Fat: 7.4g | Saturated Fat: 1g | Polyunsaturated Fat: 0.9g | Monounsaturated Fat: 5.1g | Trans Fat: 0.003g | Sodium: 818.6mg | Potassium: 390.9mg | Fiber: 1.4g | Sugar: 2.8g | Vitamin A: 249.6IU | Vitamin C: 0.6mg | Calcium: 12.1mg | Iron: 1mg

** Nutrition labels on easyanddelish.com are for educational purposes only. This info is provided as a courtesy and is only an estimate, since the nutrition content of recipes can vary based on ingredient brand or source, portion sizes, recipe changes/variations, and other factors. We suggest making your own calculations using your preferred calculator, based on which ingredients you use, or consulting with a registered dietitian to determine nutritional values more precisely.

Please note that health-focused and diet information provided on easyanddelish.com is for educational purposes and does not constitute medical advice, nor is it intended to diagnose, treat, cure, or prevent disease. Consult with your doctor or other qualified health professional prior to initiating any significant change in your diet or exercise regimen, or for any other issue necessitating medical advice.

DID YOU MAKE THIS RECIPE?Comment and rate the recipe. Also follow us on Pinterest at @easyanddelish for more delish recipes.