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Vegetarian Stuffed Portobello Mushrooms

A delicious main or side dish, these vegetarian stuffed portobello mushrooms, filled with fresh veggies, herbs and cheese, are a wonderful change of pace.

When I talk about ‘stuffed’ in this recipe, I mean STUFFED. These monsters hold a lot. We’ve packed in healthy fresh baby spinach, butternut squash, cheese, green onions, oregano, tomatoes and Panko. Really yummy!

Stuffed Portobello Mushrooms

The mushrooms are first coated and marinated in a simple balsamic, oil and Dijon dressing while you prepare the stuffing.  I added butternut squash to the stuffing because I had already bought some pre-spiralized.  You can certainly leave it out if you want, although it did add a nice bit of texture.

The recipe was inspired by 3 other recipes in the New York Times, Cooking Light and All Recipes with  few additional tweaks.  

The result is a tasty, healthy and satisfying vegetarian main dish where meat lovers (like me) don’t actually miss the meat. Jenna, the vegetarian kook, gave it two thumbs up.

Of course you can also serve the vegetarian stuffed mushrooms as a side dish with flank steak, cedar planked chicken, easy maple lime salmon , smoked chicken thighs (no smoker needed), juicy grilled pork chops or sweet and spicy salmon.

Tailor To Your Taste

  • Feel free to substitute herbs, other cheeses (e.g. goat cheese or Emmenthal) or vegetables.  I would not suggest using high water-content vegetables such as zucchini, however, as the stuffing and mushrooms may become soggy.
  • If you don’t have a grill, these healthy stuffed portobello mushrooms can be baked in a 425F/218C oven for about 8-10 minutes.

Shortcuts

  • Use pre-spiralized butternut squash or leave it out altogether.
  • Instead of grating the cheese buy it pre shredded.
  • Substitute fresh garlic with garlic from the jar or frozen cubes.
  • Marinate the mushrooms in a store-bought Balsamic or Italian salad dressing.

Make Ahead 

  • The whole thing can be prepared well in advance and grilled just before serving.
  • Or, complete the dish, then just before serving, heat under the broiler for 2 minutes.

How to make vegetarian stuffed portobello mushrooms

Portobello Mushrooms, spinach, butter, tomatoes, garlic Parmesan cheese, spiralized butternut squash, balsamic vingegar, olive oil, green onions, oregano
Portobello Mushrooms, spinach, butter, tomatoes, garlic Parmesan cheese, spiralized butternut squash, balsamic vinegar, olive oil, green onions, oregano
Portobello Mushrooms - one with gills, one with gills scraped off
Scrape gills out of mushrooms with spoon
Portobello Mushrooms marinating on pan
Marinate mushrooms for 20-30 minutes
stuffing for portobello mushrooms in bowl
Make veggie cheese herb stuffing
Stuffed Portobello Mushrooms on pan before grilling
Divide stuffing among mushrooms
Grilling Stuffed Portobello Mushrooms on gas grill
Grill mushrooms for 6-7 minutes (or see how to bake instead)

Stuffed Portobello Mushrooms

Stuffed Portobello Mushroom cut in half after grilling

 

Stuffed Portobello Mushrooms
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4.75 from 8 votes

Grilled Stuffed Portobello Mushrooms

A delicious main or side dish, these vegetarian stuffed portobello mushrooms, filled with fresh veggies, herbs and cheese, are a wonderful change of pace. When I talk about 'stuffed' in this recipe, I mean STUFFED!
Prep Time30 mins
Cook Time6 mins
Total Time36 mins
Course: Main Course, Side Dish
Cuisine: American, Vegetarian
Servings: 3 mains (or 6 sides)
Author: Cheryl

Ingredients

  • 6 large Portobello Mushrooms, stemmed

Marinade

  • 2 tablespoon olive oil
  • 2 tablespoon good balsamic vinegar
  • 1 teaspoon Dijon mustard

Stuffing

  • 2/3 cup Panko (Japanese) breadcrumbs
  • 3/4 cup shredded Mozarella cheese (or Emmenthal), divided (optional: additional grated Parmesan cheese)
  • 3 tablespoon finely chopped green onions or chives
  • 1 tablespoon fresh chopped oregano (or thyme)
  • 1/2 cup chopped tomato, juice squeezed out
  • 2 cups fresh baby spinach, roughly chopped
  • 1 cup spiralized butternut squash (OPTIONAL)
  • 2 teaspoon garlic, minced
  • 1/2 teaspoon each salt and pepper (or to taste)

Instructions

  • PREPARE AND MARINATE MUSHROOMS: Wipe/clean top of mushroom caps with a paper towel. Using a spoon, gently scrape out the black gills in the inner side of the mushroom caps and discard. Mix together marinade ingredients, brush over top and bottom of mushrooms, then set aside for 20-30 minutes to marinate. Shortcut: use a bottled salad dressing instead of marinade e.g. Italian or balsamic.
  • PREPARE GRILL: Spray grill with oil or wipe grill with oil soaked paper towel. Heat BBQ grill to medium high. Note 1 (to bake)
  • PREPARE STUFFING AND STUFF MUSHROOMS: In a medium bowl, combine all stuffing ingredients (leaving 1/4 cup of mozzarella cheese for topping). Taste and adjust seasonings. Spoon stuffing into cavity of the 6 mushroom caps, pressing down slightly to adhere. Sprinkle on remaining 1/4 cup mozzarella. If desired, sprinkle on some Parmesan cheese too.
  • GRILL AND SERVE: Place mushrooms on grill, stuffing side up. Close lid and cook about 6-7 minutes. Serve immediately.

Notes

  1. To Bake: If you don't have a grill, the Stuffed Portobello Mushrooms can be baked in a 425F oven for about 8 minutes.
  2. To Make Ahead: Complete the dish. Let mushrooms sit until needed.  Then rewarm under the broiler for 2 minutes. Or, prepare everything ahead including stuffing the mushrooms, then grill just before serving. 
 
Nutrition Value estimates include 2 stuffed mushrooms per serving. 

Nutrition

Nutrition Facts
Grilled Stuffed Portobello Mushrooms
Amount Per Serving
Calories 306 Calories from Fat 153
% Daily Value*
Fat 17g26%
Saturated Fat 5g31%
Cholesterol 22mg7%
Sodium 718mg31%
Potassium 1043mg30%
Carbohydrates 28g9%
Fiber 5g21%
Sugar 9g10%
Protein 13g26%
Vitamin A 7320IU146%
Vitamin C 21mg25%
Calcium 248mg25%
Iron 3mg17%
* Percent Daily Values are based on a 2000 calorie diet.
Tried this recipe?We'd love you to rate it above under 'rate this recipe' or in the comment section below. Thanks!

This recipe was originally posted in July 2017 and now edited above in time for grilling season. 

Here are two other dishes with mushrooms you might like: 

Mushroom Spinach Pasta
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Vegetable Couscous
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A nice change from rice, vegetable couscous is a healthy and quick vegetarian side dish. Add some beans, chicken or tofu and turn it into a full meal.
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