The photo appears to show large roasted portobello mushroom caps layered with garlicky spinach, browned mushroom slices, avocado, feta, and fresh herbs. This version recreates that combination while keeping the mushroom meaty and the toppings fresh. Similar spinach-and-feta portobello recipes use roasting temperatures around 375–400°F and sauté the spinach before stuffing.
Servings
4 large stuffed mushrooms
Prep & cooking
Prep: 20 minutes
Cook: 25–30 minutes
Total: about 50 minutes
Ingredients
Mushroom base
4 large portobello mushroom caps
2 tbsp extra-virgin olive oil
1 tbsp balsamic vinegar
½ tsp garlic powder
½ tsp dried oregano
¼ tsp smoked paprika
½ tsp salt
¼ tsp freshly ground black pepper
Spinach filling
5 oz (140 g) fresh baby spinach
2 cloves garlic, finely minced
1 tbsp olive oil
¼ small onion, finely diced
½ tsp dried thyme
¼ tsp red-pepper flakes, optional
Salt and pepper to taste
Mushroom topping
6–8 oz (170–225 g) cremini/button mushrooms, sliced
1 tbsp olive oil
1 tsp butter, optional
1 small garlic clove, minced
1 tsp fresh thyme leaves
Pinch of salt and black pepper
Avocado-feta topping
2 ripe avocados
¾ cup (about 110 g) crumbled feta
1 tbsp lemon juice
1 tsp lemon zest
1 tbsp chopped fresh parsley
1 tbsp chopped fresh dill or thyme
¼ tsp chili flakes
Freshly ground black pepper
To finish
1–2 tbsp extra feta
Fresh parsley or thyme
Lemon wedges
Small drizzle of extra-virgin olive oil
Optional: toasted pumpkin seeds or chopped walnuts
Method
1. Prepare the portobellos
Heat the oven to 400°F / 200°C.
Wipe the mushrooms clean rather than soaking them. Remove the stems. Scrape out some of the dark gills with a spoon if you prefer a cleaner-looking filling, while taking care not to break the caps.
Mix olive oil, balsamic vinegar, garlic powder, oregano, smoked paprika, salt and pepper.
Brush the mixture over both sides of the mushroom caps.
Place them gill-side down on a lined baking sheet.
2. Roast the mushroom caps
Roast for 10 minutes.
Remove from the oven and carefully pour off any liquid released by the mushrooms. This is important because excess mushroom liquid can make the finished dish watery. Similar stuffed-portobello methods specifically roast the caps first and discard accumulated liquid before filling.
Turn the mushrooms gill-side up.
3. Make the garlic spinach
Heat 1 tbsp olive oil in a skillet over medium heat.
Add onion and cook for about 2 minutes.
Add garlic and cook for another 30–60 seconds.
Add spinach, thyme and red-pepper flakes.
Cook for 2–4 minutes, stirring, until the spinach is completely wilted and most of its moisture has evaporated.
Season with salt and pepper.
Tip: Don’t leave the spinach wet. A relatively dry filling gives you the concentrated flavor and texture seen in the photograph.
4. Brown the sliced mushrooms
Heat another skillet over medium-high heat.
Add olive oil and, if using, butter.
Add sliced mushrooms in a fairly even layer. Cook for 3–5 minutes without constantly stirring, allowing them to brown.
Add garlic and thyme during the final minute.
Season lightly with salt and pepper.
You want deeply browned edges, rather than pale steamed mushrooms.
5. Make the avocado-feta mixture
Cut the avocados into chunky pieces.
Gently combine:
avocado
feta
lemon juice
lemon zest
parsley
dill/thyme
chili flakes
black pepper
Don’t mash it into a smooth guacamole. The chunky avocado and crumbly feta are part of the texture of the dish.
6. Assemble
Divide the garlic spinach between the four mushroom caps.
Pile the browned sliced mushrooms over the spinach.
Spoon the avocado-feta mixture generously on top.
Finish with a little extra feta and fresh herbs.
7. Final bake
Return to the oven for 8–12 minutes, just until the mushrooms are completely tender and hot.
For a more browned feta topping, switch to broil/grill for 1–2 minutes at the end, watching carefully.
Don’t broil the avocado for too long—you want it warm rather than dried out.
Serve immediately with lemon wedges and a small drizzle of olive oil.
Optional nut information
Is this recipe nut-free?
Yes, as written, it is nut-free.
There are no tree nuts or peanuts in the basic recipe.
However, if you’re preparing it for someone with a serious allergy:
Check the feta and other packaged ingredients for allergen statements.
Check the mushroom packaging for cross-contact information if necessary.
Don’t add the optional walnuts.
Use pumpkin seeds instead if you want crunch.
Prevent cross-contact from cutting boards, knives, pans and serving utensils.
Nut-free crunchy topping
For a nut-free variation, toast 2 tbsp pumpkin seeds (pepitas) with a pinch of smoked paprika and salt. Sprinkle over the finished mushrooms.
Approximate nutrition
For 1 large stuffed mushroom, using the basic recipe and excluding optional nuts/seeds:
Nutrient Approx. per serving
Calories 350–390 kcal
Protein 12–15 g
Carbohydrates 20–24 g
Fiber 8–10 g
Fat 25–29 g
Saturated fat 5–7 g
Sodium 500–700 mg
Sugars 5–7 g
These are estimates, because mushroom size, avocado size, feta brand and amount of oil can substantially change the numbers. For comparison, published stuffed-portobello recipes range considerably in nutrition depending on their fillings and portion sizes.
Recipe Q&A
Q: Can I make these vegan?
Yes. Replace feta with a vegan feta-style cheese, or use a mixture of mashed white beans, lemon juice, nutritional yeast and herbs.
Q: Can I prepare them ahead?
Yes. Prepare the mushroom, spinach and sautéed-mushroom components up to a day ahead. Refrigerate separately. Add the avocado mixture shortly before baking/serving for the best color and texture.
Q: How do I stop the mushrooms from becoming watery?
Pre-roast them and pour off the released liquid before stuffing. Also cook the spinach until its excess moisture has evaporated. This is a key technique in several stuffed-portobello recipes.
Q: Can I use frozen spinach?
Absolutely. Use about 5–6 oz frozen spinach, thaw completely and squeeze it very dry before sautéing.
Q: Can I skip the avocado?
Yes. Add extra feta, roasted red peppers, white beans or a spoonful of hummus instead.
Q: Can I use goat cheese instead of feta?
Yes. Goat cheese gives a creamier, tangier result.
Q: Are these gluten-free?
The basic recipe is gluten-free, provided all packaged ingredients are certified/labelled appropriately. Unlike some stuffed-mushroom recipes that use breadcrumbs or stuffing mix, this version doesn’t require them.
Q: Are these keto-friendly?
They are relatively low in carbohydrates and high in fiber, but whether they fit a particular ketogenic target depends on your individual daily carbohydrate limit.
Q: What can I serve with them?
A lemony arugula salad, roasted vegetables, quinoa, brown rice, or crusty gluten-free bread all work well.
Q: Can I air-fry them?
Yes. Air-fryer stuffed portobello recipes commonly use approximately 15 minutes of cooking for the filled mushrooms. For this version, air-fry the prepared caps around 375°F/190°C, then check for tenderness and add a few minutes if necessary.
Q: Why add the avocado after roasting rather than before?
Avocado becomes softer and can lose its fresh flavor when exposed to prolonged high heat. Adding it toward the end preserves the bright green color, creamy texture and fresh lemon flavor.
Q: Can I make this more filling as a main meal?
Yes. Add ½–1 cup cooked quinoa, lentils or white beans to the spinach layer. This substantially increases protein and makes the dish more substantial.
With years of experience in restaurant research and local SEO, Sara creates accurate, user-friendly guides that work for both people and search engines. Her goal is to help users go from search results to their nearest restaurant or menu choice with as few clicks as possible.
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