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A cheesy stuffed Portobello mushroom with quinoa and spinach, plated over a bed of fresh greens.

Stuffed Portobello Mushroom with Quinoa and Spinach

Allison Dennison
Stuffed Portobello Mushroom with Quinoa and Spinach is a flavorful, nutrient-packed dish perfect for clean eating. Tender Portobello mushrooms are stuffed with a savory quinoa and spinach filling, enhanced with sun-dried tomatoes and a cheesy topping. This versatile recipe is gluten-free, vegetarian, and easily customizable to suit any diet, making it ideal for weeknight dinners or impressive gatherings. Ready in under 30 minutes, it’s a delicious and healthy choice that’s sure to satisfy!
Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Course Dinner, Lunch, Main Course
Cuisine Clean Eats, Mediterranean-inspired, Vegetarian/Plant-Based
Servings 4
Calories 250 kcal

Equipment

  • Cutting Board – For chopping spinach, sun-dried tomatoes, and other ingredients.
  • Chef’s Knife – For dicing vegetables and removing mushroom stems.
  • Mixing Bowl – To combine the quinoa filling ingredients.
  • Large Spoon – For scooping and stuffing the mushroom caps.
  • Baking Sheet – To arrange and bake the stuffed mushrooms.
  • Parchment Paper or Baking Mat – To line the baking sheet and prevent sticking.
  • Skillet or Sauté Pan – For cooking the onions, garlic, and spinach before mixing into the stuffing.
  • Spatula or Wooden Spoon – For stirring ingredients in the skillet.
  • Measuring Cups and Spoons – To measure out quinoa, seasonings, and other ingredients accurately.
  • Small Saucepan – For cooking the quinoa (if not pre-cooked).
  • Brush or Paper Towel – To clean the Portobello mushrooms and apply olive oil.
  • Oven or Air Fryer – For baking the stuffed mushrooms.
  • Tongs or Oven Mitts – For safely removing the baking sheet from the oven.
  • Serving Platter – To beautifully present the baked mushrooms.

Ingredients
  

For the mushrooms:

  • 4 large Portobello mushrooms stems removed and gills scraped
  • 2 tbsp olive oil
  • 1/2 tsp garlic powder
  • Salt and pepper to taste

For the stuffing:

  • 1 cup cooked quinoa follow package instructions
  • 2 cups fresh spinach chopped
  • 1 small onion finely diced
  • 2 garlic cloves minced
  • 1/4 cup sun-dried tomatoes chopped
  • 1/4 cup feta cheese optional, or substitute with vegan feta
  • 2 tbsp fresh parsley chopped (plus more for garnish)
  • 1/2 tsp smoked paprika
  • 1/2 tsp Italian seasoning
  • Salt and pepper to taste
  • 2 tbsp olive oil

For topping:

  • 1/4 cup shredded mozzarella or dairy-free cheese alternative
  • 2 tbsp grated Parmesan optional

Instructions
 

Step 1: Prepare the Mushrooms

  • Preheat your oven to 375°F (190°C).
  • Clean the mushrooms by gently wiping them with a damp paper towel. Remove the stems and use a spoon to scrape out the gills.
  • Brush the mushrooms with olive oil, then sprinkle with garlic powder, salt, and pepper. Arrange them cap-side down on a baking sheet lined with parchment paper.

Step 2: Cook the Quinoa

  • If you haven’t already, cook the quinoa according to package instructions and set aside to cool slightly.

Step 3: Make the Filling

  • Heat 2 tablespoons of olive oil in a skillet over medium heat. Add the diced onion and sauté until translucent, about 3-4 minutes.
  • Stir in the minced garlic and cook for another minute until fragrant.
  • Add the chopped spinach and cook until wilted, about 2 minutes.
  • Remove the skillet from heat and stir in the cooked quinoa, sun-dried tomatoes, feta cheese, parsley, smoked paprika, Italian seasoning, salt, and pepper. Mix until well combined.

Step 4: Assemble and Bake

  • Spoon the filling evenly into each mushroom cap, pressing it down gently to pack it in.
  • Sprinkle shredded mozzarella and Parmesan cheese (if using) on top of the filling.
  • Bake in the preheated oven for 20-25 minutes, or until the mushrooms are tender and the cheese is melted and bubbly.

Step 5: Garnish and Serve

  • Remove the mushrooms from the oven and let them cool slightly.
  • Garnish with additional fresh parsley and serve warm. Pair with a fresh green salad or roasted vegetables for a complete meal!

Notes

Make Ahead and Storage

Make Ahead:
  • You can prepare the stuffing up to 2 days in advance and store it in an airtight container in the fridge. When ready to assemble, simply stuff the mushrooms and bake.
  • The mushrooms can also be cleaned, prepped, and stored in the fridge until you’re ready to use them.
Storage:
  • Store leftover stuffed mushrooms in an airtight container in the refrigerator for up to 3 days.
  • Reheat in the oven at 350°F (175°C) for 10-15 minutes or until warmed through.
  • Avoid freezing as the mushrooms may become too watery upon thawing.
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