01
Step 1
Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
Mushroom and Spinach Stuffed Portobello Caps
Tender portobello mushrooms filled with sautéed spinach, garlic, herbs, and Parmesan cheese.
Large portobello mushroom caps hold a savory filling of spinach, garlic, onion, and Parmesan, finished with a golden breadcrumb topping. This satisfying vegetable dish works as a light dinner, lunch, or flavorful side.
By Jentezen Reed, Ph.D.
October 15, 2026
Blue Regions contributor
Prep
15 min
Cook
30 min
Total
45 min
Serves
4
Difficulty
Easy
About this recipe
Stuffed portobello mushrooms offer a simple way to make vegetables the centerpiece of a meal. Removing the stems creates room for a filling made with sautéed spinach, onion, garlic, and cheese. Pre-baking the caps helps release some of their moisture before they are filled, keeping the finished dish from becoming watery. Serve them hot from the oven with a crisp salad or cooked whole grains.
What you'll need
Ingredients
Servings
4
- 4 large
- 1 tbsp
- 1 small
- 2 cloves
- 5 oz
- 0.25 tsp
- 0.25 tsp
- 0.5 tsp
- 0.33 cup
- 0.25 cup
- 1 tbsp
- 2 tbsp
Let's cook
Step-by-step instructions
02
Step 2
Remove the stems from the mushroom caps and finely chop the stems to use in the filling. Place the caps on the prepared baking sheet with the hollow side facing up.
03
Step 3
Brush the mushroom caps lightly with half the olive oil. Bake for 8 minutes to release some moisture.
04
Step 4
Meanwhile, heat the remaining olive oil in a skillet over medium heat. Add the chopped onion and mushroom stems and cook for 4 to 5 minutes, stirring occasionally, until softened.
05
Step 5
Add the garlic and cook for 30 seconds. Stir in the spinach, thyme, salt, and black pepper. Cook for 3 to 5 minutes, until the spinach has wilted and most of its liquid has evaporated.
06
Step 6
Remove the skillet from the heat. Stir in the Parmesan, breadcrumbs, and lemon juice until the filling is evenly combined.
07
Step 7
Remove the mushroom caps from the oven. If liquid has collected inside them, carefully drain it.
08
Step 8
Divide the spinach mixture among the mushroom caps, pressing it gently into place.
09
Step 9
Return the stuffed mushrooms to the oven and bake for 15 to 18 minutes, until the caps are tender and the filling is hot with a lightly browned top.
10
Step 10
Let the mushrooms rest for 2 minutes. Garnish with optional fresh parsley and serve warm.
Nutrition
Nutritional information
Calories
210
Protein
12g
Carbohydrates
15g
Fat
12g
Fiber
4g
Kitchen notes
Notes
Nutrition values are estimates per serving. Mushroom size and moisture content can affect cooking time. If the caps release a large amount of liquid during pre-baking, carefully drain it before adding the filling. Check the breadcrumb packaging if preparing the dish for someone with specific dietary requirements.
Tips
Choose large, firm portobello caps with intact edges. Wipe the mushrooms clean with a damp cloth rather than soaking them in water. Cook the spinach until most of its moisture has evaporated before mixing the filling. For a more golden topping, place the stuffed mushrooms under the broiler for the final 1 to 2 minutes, watching closely.
Substitutions
Use crumbled feta in place of some or all of the Parmesan for a sharper, tangier filling. Replace the whole-grain breadcrumbs with finely chopped walnuts for a different texture. Fresh basil or thyme can replace the parsley. For a dairy-free version, omit the Parmesan or use a plant-based alternative.
Serving suggestions
Serve with a tomato and cucumber salad, roasted carrots, or steamed green beans. For a more substantial meal, pair with quinoa, brown rice, or lentils. Finish with fresh parsley and a squeeze of lemon juice just before serving.
Related reading
More from Blue Regions
Our Editorial Standards
Blue Regions reviews recipes and related content before publication and makes corrections or updates when needed. Nutrition information, where provided, is an estimate and may vary. We may use AI tools to assist with writing and visual content. Some images may be AI-generated illustrations rather than photographs of the actual dish. We remain responsible for the content we publish.
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