These Spinach & Cheese Stuffed Portobello Mushrooms are hearty, savory, and wonderfully cheesy. Meaty roasted portobello caps are filled with creamy spinach, cottage cheese, mozzarella, and feta, then baked until hot and golden. They make a delicious vegetarian main dish, side, appetizer, or light dinner. Similar versions use spinach with ricotta or cottage cheese, mozzarella, and feta and bake the filled caps until bubbly and lightly browned.
Recipe Details
Prep Time: 15 minutes
Cook Time: 25–30 minutes
Total Time: 40–45 minutes
Servings: 4
Difficulty: Easy
Cuisine: Vegetarian / American-Mediterranean inspired
Ingredients
For the Mushrooms
4 large portobello mushroom caps
1 tablespoon olive oil
¼ teaspoon salt
¼ teaspoon black pepper
½ teaspoon Italian seasoning
For the Spinach & Cheese Filling
10 ounces frozen chopped spinach, thawed and squeezed very dry
or about 5–6 cups fresh spinach
½ cup cottage cheese
½ cup shredded mozzarella cheese
½ cup crumbled feta cheese
1 large egg
2 cloves garlic, minced
¼ teaspoon garlic powder
¼ teaspoon black pepper
¼ teaspoon red pepper flakes, optional
1 tablespoon grated Parmesan cheese
1 tablespoon fresh parsley, chopped
½ teaspoon Italian seasoning
Optional Serving Sauce
½ cup marinara sauce
Fresh basil or parsley for garnish
Extra Parmesan, for serving
Instructions
Step 1: Preheat the Oven
Preheat your oven to 400°F (200°C).
Line a baking sheet with parchment paper or lightly grease it.
Step 2: Prepare the Portobello Mushrooms
Gently wipe the mushrooms clean with a damp paper towel.
Remove the stems.
If you want extra room for the filling, gently scrape out the dark gills underneath the caps using a spoon.
Brush both sides of the mushrooms lightly with olive oil.
Season the inside with salt, black pepper, and Italian seasoning.
Place the mushrooms gill-side up on the prepared baking sheet.
Step 3: Pre-Bake the Mushroom Caps
Bake the empty mushrooms for 8–10 minutes.
Portobello mushrooms naturally release quite a bit of water while cooking, so pre-baking helps prevent the finished dish from becoming excessively watery. Pre-roasting the caps before filling is also used in several stuffed-portobello preparations.
Remove the mushrooms from the oven.
Carefully pour off any liquid that has accumulated inside the caps.
Step 4: Prepare the Spinach
If using frozen spinach, thaw it completely.
Place it in a clean kitchen towel or several layers of paper towel and squeeze out as much moisture as possible.
This is extremely important for a creamy rather than watery filling.
If using fresh spinach, sauté it in a skillet with the garlic for 2–3 minutes until wilted, then cool slightly and chop.
Step 5: Make the Cheese Filling
In a medium bowl, combine:
Spinach
Cottage cheese
Mozzarella
Feta
Egg
Garlic
Garlic powder
Parmesan
Italian seasoning
Black pepper
Red pepper flakes
Parsley
Mix until everything is evenly combined.
Taste the mixture before adding additional salt because feta can already be quite salty.
Step 6: Stuff the Mushrooms
Divide the spinach and cheese mixture evenly among the four mushroom caps.
Mound the filling slightly above the edges of each mushroom.
Sprinkle a little additional mozzarella or Parmesan over the top if desired.
Step 7: Bake
Return the stuffed mushrooms to the oven.
Bake for approximately 15–20 minutes, until:
The mushrooms are tender
The filling is hot throughout
The cheese is melted
The tops are lightly golden
For a more deeply browned cheesy topping, switch the oven to broil for 1–2 minutes at the end.
Watch carefully because cheese can brown quickly.
Step 8: Add Marinara & Garnish
Warm the marinara sauce separately.
Spoon a little marinara onto each serving plate or drizzle it lightly over the finished mushrooms.
Garnish with fresh parsley or basil and a little Parmesan.
Serve immediately.
What to Serve With Them
These stuffed portobellos are delicious with:
Mediterranean salad
Greek salad
Roasted vegetables
Garlic green beans
Cauliflower rice
Quinoa
Crusty bread
Whole-grain pasta
Marinara sauce
Tzatziki
For a low-carb meal, serve with a large green salad, roasted broccoli, or cauliflower rice.
Tips for Perfect Stuffed Portobellos
Squeeze the Spinach Very Dry
Extra moisture is the biggest enemy of a good stuffed mushroom. Thoroughly drained spinach produces a much better filling.
Don’t Soak the Mushrooms
Instead of washing them under running water, gently wipe them clean with a damp paper towel.
Adjust the Cheese
For a richer filling, use more mozzarella. For a stronger flavor, increase the Parmesan or feta.
Broil at the End
A short blast under the broiler creates that beautiful golden, bubbly cheese topping.
Add Some Heat
Red pepper flakes or finely diced jalapeño work beautifully with the creamy spinach filling.
Delicious Variations
Creamy Ricotta Version
Replace the cottage cheese with ½ cup ricotta for an extra-smooth filling.
Mediterranean Version
Add chopped sun-dried tomatoes, fresh basil, oregano, and a few chopped Kalamata olives.
Mushroom-Lover’s Version
Finely chop the removed mushroom stems and sauté them with the garlic before adding them to the filling.
Spinach & Bacon
Add ½ cup cooked, crumbled bacon for a smoky version.
Spicy Spinach Mushrooms
Add red pepper flakes, chili powder, or finely diced jalapeño.
High-Protein Version
Add finely chopped cooked chicken to the spinach-and-cheese mixture.
Nut Information
The recipe above is naturally peanut-free and tree-nut-free.
There are no nuts required in the basic recipe.
However, always check labels on packaged ingredients such as:
Cottage cheese
Feta
Mozzarella
Parmesan
Marinara sauce
Seasoning blends
Some packaged products can be made in facilities that also process peanuts or tree nuts.
For a Strict Nut-Free Preparation
If preparing this for someone with a severe nut allergy:
Choose ingredients appropriate for their allergy requirements.
Check all allergen statements.
Use clean utensils and cookware.
Prevent cross-contact with nut-containing foods.
Optional nuts such as pine nuts, walnuts, or almonds are not needed for this recipe. In fact, some stuffed-portobello recipes do add pine nuts, so leave them out if you want to keep this version nut-free.
Frequently Asked Questions
1. Can I use fresh spinach instead of frozen?
Absolutely. Use about 5–6 cups fresh spinach, sauté until wilted, then squeeze out excess moisture and chop.
2. Can I use ricotta instead of cottage cheese?
Yes. Use ½ cup ricotta. It will give the filling a smoother, more traditional stuffed-mushroom texture.
3. Can I use only mozzarella?
Yes, although feta and Parmesan add more flavor. If using only mozzarella, add a little extra garlic, Italian seasoning, and black pepper.
4. Why are my mushrooms watery?
Portobellos naturally contain a lot of water. Pre-baking the caps and pouring off the accumulated liquid helps significantly. Thoroughly squeezing the spinach is equally important.
5. Can I prepare these ahead of time?
Yes. Prepare the filling up to 1 day ahead and refrigerate it in an airtight container. Stuff the mushrooms shortly before baking.
6. Can I freeze stuffed portobello mushrooms?
They are best eaten fresh. Freezing can change the texture of the mushrooms and make them more watery after thawing.
7. Can I make this gluten-free?
Yes. The basic recipe is naturally gluten-free as long as all packaged ingredients, particularly marinara and seasonings, are certified or labeled gluten-free when required.
8. Can I make them without eggs?
Yes. The egg helps bind the filling, but you can omit it and add a little extra cottage cheese or ricotta. The filling may be softer.
9. How do I make them more filling?
Serve two smaller stuffed mushrooms per person or pair them with quinoa, rice, roasted potatoes, or a protein such as grilled chicken.
10. Can I use baby portobello mushrooms?
Yes. Reduce the baking time because smaller mushrooms will cook faster. They make excellent appetizers.
Final Serving Idea
Serve these Spinach & Cheese Stuffed Portobello Mushrooms hot and bubbly, topped with golden mozzarella and Parmesan, a spoonful of warm marinara, and fresh parsley or basil. The combination of earthy roasted mushrooms, creamy cottage cheese, salty feta, melted mozzarella, and garlicky spinach makes every bite incredibly satisfying.
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