Baked Stuffed Portobello Mushrooms with Spinach and Feta

Stuffed portobello mushrooms make a generous vegetarian main or substantial side, using the mushroom cap as both the vessel and a source of deep, savoury flavour. In this version, the filling combines wilted spinach, chopped mushroom stems, garlic, feta and breadcrumbs, with lemon zest adding brightness against the salty cheese. Baking softens the portobellos until tender while the breadcrumb topping turns lightly golden, giving the dish a pleasing mix of juicy mushroom, creamy filling and crisp edges. Serve hot with a simple salad for an easy dinner, or alongside other vegetable dishes as part of a larger spread.
Cuisine style Vegetarian American-style comfort cooking
Cooking style Meal prep friendly
Time commitment Under 1 hour

Why this recipe works

  • Tender base, crisp topping: Portobello mushrooms soften in the oven while the reserved breadcrumbs give the filling a lightly crisp finish.
  • Bright, balanced filling: Lemon zest and a little juice lift the salty feta and earthy mushrooms without overpowering the spinach.
  • Straightforward method: The filling is simply sautéed, mixed, spooned into the mushroom caps and baked, making the recipe approachable for everyday cooking.

Get the most out of this recipe

Common mistakes

  • Avoid a watery filling: Cook the spinach until the pan is nearly dry before mixing it with the feta and breadcrumbs.
  • Do not overpack the caps: Press the filling in lightly rather than compacting it, so it stays tender instead of dense.
  • Watch the final bake: Bake just until the mushrooms are tender and the top is golden; leaving them too long can make the caps collapse and release excess liquid.

Ingredient notes

  • Choose sturdy portobellos: Look for large mushroom caps that feel firm and intact, as they hold the filling better during baking.
  • Season with the feta in mind: Feta varies in saltiness, so taste the filling before adding any extra seasoning.
  • Use lemon to finish: A small squeeze of lemon brightens the filling; add it gradually so the cheese and mushrooms remain savoury rather than sharp.

Make-ahead tips

  • Prepare the filling ahead: The spinach and feta mixture can be made in advance and kept chilled, then spooned into the mushroom caps before baking.
  • Reheat gently: Reheat on a baking tray at 180°C (355°F) until piping hot; the breadcrumb topping will be softer than when freshly baked.
  • Best freshly baked: For the crispest topping and firmest mushroom texture, serve the stuffed mushrooms soon after baking.

Serving ideas

  • Serve with salad: A crisp green salad balances the rich feta and earthy mushrooms.
  • Make it more substantial: Serve alongside herbed rice, couscous or roasted potatoes for a fuller vegetarian meal.
  • Finish with freshness: A little extra lemon zest or chopped soft herbs adds brightness just before serving.

Equipment you'll need

Ingredients
Instructions
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  1. Heat the oven to 200°C (390°F). Wipe the mushrooms clean, then twist out the stems and finely chop them. Put the mushroom caps on a baking tray, gill-side up, and brush with about half the olive oil.
  2. Warm the remaining olive oil in a large frying pan over a medium heat. Add the chopped mushroom stems and cook for 3 to 4 minutes until softened, then add the garlic and cook for 30 seconds until fragrant. Add the spinach in batches and cook until fully wilted and any liquid has evaporated.
  3. Tip the spinach mixture into a mixing bowl and let it cool for 2 minutes. Finely grate in the lemon zest, then crumble in the feta and add most of the breadcrumbs, reserving a small handful for the top. Stir in the black pepper and squeeze in a little lemon juice to brighten the filling.
  4. Divide the filling between the mushroom caps, pressing it in lightly. Sprinkle over the reserved breadcrumbs for a crisp top. Bake for 18 to 20 minutes until the mushrooms are tender and the topping is golden.

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Recipe notes

Serving suggestions

This recipe pairs well with:

A simple salad

Tips

  • If your mushrooms release a lot of liquid, spoon it away from the tray halfway through baking so the topping stays crisp.
  • For the best texture, cook the spinach until the pan is nearly dry before mixing in the feta and breadcrumbs.
  • If serving anyone who is vulnerable, use pasteurised feta and ensure the mushrooms are baked until piping hot throughout.

Substitutions

  • Replace Feta cheese with Goat cheese for a creamier, tangier filling.
  • Replace Breadcrumbs with Gluten-free bread crumbs to make the topping gluten-free.

Storage

  • Refrigerate up to 2 days
  • Cool completely, then refrigerate in a sealed container. Reheat on a baking tray at 180°C (355°F) for 10 to 12 minutes until piping hot; the topping will soften slightly.

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Recipe overview

  • Servings: 2 servings
  • Total time: 40min (20min active)
  • Difficulty: Easy
  • Cuisine: American
  • Allergens:
    Gluten Milk Wheat
Beginner friendly With serving suggestions Kid friendly

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