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portobello mushroom steaks paired with mashed potatoes and asparagus served on a white plate
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5 from 5 votes

Portobello Mushroom Steaks

Juicy portobello mushroom steaks paired with mashed potatoes and asparagus make a complete vegan meal that is hearty, simple, and totally mouth-watering!
Prep Time10 mins
Cook Time30 mins
Total Time40 mins
Course: Main Course
Cuisine: American, Vegan
Servings: 4
Calories: 185kcal
Author: Anjali Shah


  • 4 portobello mushrooms
  • cup balsamic vinegar
  • ¼ cup olive oil
  • ½ tsp cumin
  • ½ tsp black pepper
  • ½ tsp smoked paprika
  • 3 cloves garlic
  • 1 tbsp vegan friendly steak seasoning
  • ½ tsp salt more or less to taste
  • ½ tsp black ground pepper
  • 1 bunch asparagus


  • Preheat the oven to 400 F.
  • In a large bowl, make the steak’s marinade while combining olive oil, balsamic vinegar, spices and chopped garlic. 
  • Place portobellos and asparagus in an oven-safe skillet. With a pastry brush, generously brush the marinade on the tops and bottoms of both mushrooms and asparagus.
  • Set mushrooms top side down and place the remaining marinade over them. Bake for 20 minutes.
  • Remove from oven, flip, and bake another 5-10 minutes until mushrooms are cooked all the way through. 
  • Follow this recipe for the side of mashed potatoes. Serve immediately.



Top Tips for Making Portobello Mushrooms Steaks
  • Use a damp towel to clean the mushrooms.
  • Do not wash them under the faucet, or soak them in a bowel of water. Mushrooms absorb water quickly, and if you do this you will end up with mushy mushroom steaks.
  • If you'd rather grill these on an open flame, you will not need to leave them on the grill for as long. I recommend 4-6 minutes per side.
  • If you've bought whole mushrooms, be sure to remove the stems.
  • Use a spoon to scrape off the gills. Portobellos have black gills that are edible, but can cause a dark gray look. Remove the gills if you choose.
  • For the side of mashed potatoes, follow this recipe.
Note: Nutrition facts do not include the side of mashed potatoes.


Calories: 185kcal | Carbohydrates: 13g | Protein: 5g | Fat: 14g | Saturated Fat: 2g | Sodium: 307.3mg | Potassium: 862mg | Fiber: 3.3g | Sugar: 4.7g