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WW Recipe of the Day: Low Calorie Marinated Portabello “Steaks”
Because of their meaty texture, Portabello mushrooms have been compared to “steaks” for years. In this version, all the succulent ingredients that usually make up a steak marinade—like Worcestershire sauce, soy and mustard—are rubbed into mushrooms and then baked or grilled until tender.
These tasty marinated mushrooms are great sliced atop a salad or used as the foundation for a vegetarian WW friendly burger. My beef-loving husband thought they would be perfect on a burger.
With only about 100 calories per large mushroom, hearty appetites may want to double up on the mushrooms, depending on their size, to create a satisfying entree.
As a side dish, 1 meaty mushroom should be sufficient. These mushrooms can be cooked, either on the grill or in the oven.

Table of Contents
- How Many Calories and WW Points in Grilled Marinated Portabello Mushroom Steaks?
- How to Make Easy Healthy Marinated Portabello “Steaks” Step-by-Step:
- Recipe Notes
- What Are Some Other Marinade Ideas for Portabello Mushroom Steaks?
- Serving Suggestions
- What to do with Leftovers?
- Grilled Marinated Portabello Mushroom “Steaks” Recipe
How Many Calories and WW Points in Grilled Marinated Portabello Mushroom Steaks?
According to my calculations, each serving has 100 calories.
To see your WW Points for this recipe, track it in the WW App!
(You must be logged into WW on a smartphone or tablet.)
2 SmartPoints (Green plan)
2 SmartPoints (Blue plan)
2 SmartPoints (Purple plan)
2 PointsPlus (Old plan)
How to Make Easy Healthy Marinated Portabello “Steaks” Step-by-Step:
Step 1: Gather and prep you ingredients.

Step 2: Mix the marinade and brush onto your mushrooms.

Step 3: Let marinate for 10 minutes and then bake or grill until tender and bubbly. Cool slightly and serve.

Recipe Notes
- Go lightly with salt as the Worcestershire, Montreal steak seasoning, mustard and even the reduced-sodium soy sauce, are all salty.
- If you are a spice lover, add more cayenne.
- As a main course, try the “cheese steak” idea and sprinkle with wide shreds of parmesan or a teaspoon of soft cheese.
What Are Some Other Marinade Ideas for Portabello Mushroom Steaks?
- Low fat Italian dressing and Italian seasoning
- Olive oil and lemon juice
- Olive oil, soy sauce, apple cider vinegar, brown sugar, oregano, garlic powder, onion powder, smoked paprika
- Olive oil, red wine vinegar, chopped parsley, soy sauce, garlic, red pepper flakes, salt
- Olive oil, white wine, garlic, red pepper flakes, lemon zest, salt, pepper

Serving Suggestions
- Serve 2 mushrooms each as an entree with a side salad.
- Slice and place atop a salad with a sprinkling of blue cheese.
- Turn the mushrooms into “burgers” by serving them in a light bun or english muffin with lettuce, tomato and other burger condiments.
- Slice them and put them over a sauced pasta.
- As a side dish, serve alongside any grilled poultry or pork dish as well as fish. Sauteed spinach would be a good green addition to the plate.
- Ways to Use Leftovers
What to do with Leftovers?
Store any leftovers, covered, in the refrigerator. The can be reheated in the microwave (affiliate link). Cold mushrooms can be sliced or chopped and added to salads, soups or as filling for tacos, quesadillas or grilled cheese.
If you’ve made these Marinated Portabello Mushroom Steaks, please give the recipe a star rating below and leave a comment letting me know how you liked it. And stay in touch on Pinterest, Facebook, Instagram and Twitter for the latest updates.

Grilled Marinated Portabello Mushroom “Steaks”
Equipment
Ingredients
- 2 tablespoons balsamic vinegar
- 2 teaspoons olive oil
- 1 teaspoons Dijon mustard
- 2 teaspoons low-sodium soy sauce
- 1 teaspoon Worcestershire sauce
- 1 large garlic clove, minced
- 1 teaspoon Montreal Steak Seasoning (or salt and pepper to taste)
- Pinch of cayenne pepper, optional
- 2 large portabello mushrooms, stems removed
Instructions
- Heat up the grill or preheat the oven to 400F degrees
- If you are going to cook your mushrooms in the oven, line a small baking dish with foil and spray the foil with nonstick spray.
- In a small bowl (affiliate link), stir together the balsamic, olive oil, mustard, soy sauce, Worcestershire sauce, garlic, Montreal steak seasoning (or salt & pepper) and pinch of cayenne (if using) until thoroughly mixed.
- Brush the mushrooms with the mixture and gently "massage" the marinade into the gills and back of the mushrooms. Let sit for 10 minutes to let the marinade absorb.
- Place marinated mushrooms on baking sheet (affiliate link), gills side up, and bake for 15 to 20 minutes, or until soft and slightly bubbly. Alternatively you can grill them gill side up for 5 to 7 minutes and then flip them and continue to cook until tender, 5 to 7 minutes more.
- Remove from oven and cool slightly before serving.
Notes
(Must be logged into WW on a smartphone or tablet.) 2 SmartPoints (Green plan) 2 SmartPoints (Blue plan) 2 SmartPoints (Purple plan) 2 PointsPlus (Old plan) More Marinade Ideas:
- Low fat Italian dressing and Italian seasoning.
- Olive oil and lemon juice.
- Olive oil, soy sauce, apple cider vinegar, brown sugar, oregano, garlic powder, onion powder, smoked paprika.
- Olive oil, red wine vinegar, chopped parsley, soy sauce, garlic, red pepper flakes, salt.
- Olive oil, white wine, garlic, red pepper flakes, lemon zest, salt, pepper.
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
Source: Eat What You Love Quick & Easy (affiliate link) by Marlene Koch





I love these! I ditch the oil to shave off even more calories. My husband and I do the 5:2 diet and these are perfect for dinner on our low-cal days. I make them alongside cauliflower mash and a green of some sort. Weโve had them twice now and will be making them again!
Amazing, simple, filling! This was bursting with flavor! I will for sure make these again and again. Thanks for a great recipe!