Perfect Baked Stuffed Portobello Mushrooms with Quinoa

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I’ve been making these stuffed portobellos for years now, and they never fail to impress at dinner parties. What started as a way to use up leftover quinoa has become one of my go-to vegetarian mains. The combination of nutty quinoa, sautéed vegetables, and those meaty mushroom caps creates something really satisfying.

Portobello mushrooms have this amazing ability to hold their shape while baking, which makes them perfect vessels for stuffing. I learned this trick from my neighbor who grows her own mushrooms: remove the stems and scrape out the dark gills with a spoon. This prevents the filling from getting soggy and gives you more room to work with. The key is choosing mushrooms that are firm and dry, about 4 to 5 inches across.

Why Portobello Mushrooms Work So Well

The quinoa filling is where you can really get creative. I like to cook the quinoa in vegetable broth instead of water for extra flavor, then mix it with sautéed onions, bell peppers, and whatever herbs I have on hand. Fresh thyme works beautifully here, but dried oregano or basil are good substitutes. A handful of pine nuts adds nice texture, and a squeeze of lemon juice brightens everything up.

Building the Perfect Quinoa Filling

These work perfectly as a main course for vegetarian guests, but they’re also great as a hearty side dish alongside grilled chicken or fish. I usually serve them with a simple green salad and some crusty bread. The best part is you can assemble them earlier in the day and just pop them in the oven when you’re ready to eat.

Perfect Baked Stuffed Portobello Mushrooms with Quinoa - Mediterranean recipe
I've been making these stuffed portobellos for years now, and they never fail to impress at dinner parties. What started as a way to use up leftover quinoa has become one of my go-to vegetarian mains. The combination of nutty quinoa, sautéed vegetables, and those meaty mushroom caps creates something really satisfying. Portobello mushrooms have this amazing ability to hold their shape while baking, which makes them perfect vessels for stuffing. I learned this trick from my neighbor who grows her own mushrooms: remove the stems and scrape out the dark gills with a spoon. This prevents the filling from getting soggy and gives you more room to work with. The key is choosing mushrooms that are firm and dry, about 4 to 5 inches across. The quinoa filling is where you can really get creative. I like to cook the quinoa in vegetable broth instead of water for extra flavor, then mix it with sautéed onions, bell peppers, and whatever herbs I have on hand. Fresh thyme works beautifully here, but dried oregano or basil are good substitutes. A handful of pine nuts adds nice texture, and a squeeze of lemon juice brightens everything up. These work perfectly as a main course for vegetarian guests, but they're also great as a hearty side dish alongside grilled chicken or fish. I usually serve them with a simple green salad and some crusty bread. The best part is you can assemble them earlier in the day and just pop them in the oven when you're ready to eat.
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Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Servings: 4 servings
Course: Main Course
Cuisine: Jewish, Mediterranean
Calories: 285
Ingredients Method Notes

Ingredients
  

  • 4 large portobello mushroom caps stems removed, gills scraped out
  • 1 cup quinoa rinsed
  • 2 cups vegetable broth
  • 3 tablespoons olive oil divided
  • 1 medium onion diced
  • 1 medium red bell pepper diced
  • 3 cloves garlic minced
  • 1/4 cup pine nuts
  • 2 tablespoons fresh thyme leaves or 1 tablespoon dried
  • 1/4 cup fresh parsley chopped
  • 2 tablespoons lemon juice freshly squeezed
  • 1 teaspoon kosher salt
  • 1/2 teaspoon black pepper freshly ground
  • 1/4 cup panko breadcrumbs for topping

Method
 

  1. Preheat oven to 425°F. Line a baking sheet with parchment paper.
  2. Remove mushroom stems and scrape out dark gills with a spoon. Brush mushroom caps with 1 tablespoon olive oil and season with salt and pepper. Place gill-side up on prepared baking sheet.
  3. Rinse quinoa in fine mesh strainer until water runs clear. In medium saucepan, bring vegetable broth to boil. Add quinoa, reduce heat to low, cover and simmer 15 minutes until liquid is absorbed. Remove from heat and let stand 5 minutes, then fluff with fork.
  4. Meanwhile, heat remaining 2 tablespoons olive oil in large skillet over medium heat. Add onion and bell pepper, cook 5 minutes until softened. Add garlic and cook 1 minute more until fragrant.
  5. Add cooked quinoa to skillet with vegetables. Stir in pine nuts, thyme, parsley, lemon juice, salt, and pepper. Mix well and taste for seasoning.
  6. Divide quinoa mixture evenly among mushroom caps, mounding slightly. Sprinkle tops with panko breadcrumbs.
  7. Bake 20-25 minutes until mushrooms are tender and breadcrumbs are golden brown. Let cool 5 minutes before serving.

Notes

These can be assembled up to 4 hours ahead and refrigerated until ready to bake. Add 5 minutes to cooking time if baking from cold. Leftover stuffed mushrooms keep in refrigerator for 3 days and reheat well in 350°F oven for 10 minutes. For extra richness, drizzle with a little extra olive oil before serving.
Nutrition Facts
4 servings per recipe
Serving size 1 serving
Calories 285
% Daily Value*
Total Fat 11g 14%
Saturated Fat 2g 10%
Trans Fat 0g
Cholesterol 0mg
Sodium 580mg 25%
Dietary Fiber 6g 21%
Total Sugars 8g
Protein 12g 24%
*Percent Daily Values are based on a 2,000 calorie diet.
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