Indulge in a delightful and healthy meal with stuffed grilled portobello mushroom caps. These savory mushrooms are filled with a delicious blend of spinach, tomatoes, and cheeses, making them a perfect appetizer or main course. The combination of flavors and textures will surely impress your taste buds and your guests.
If you don't usually keep portobello mushroom caps or fresh spinach at home, you might need to make a trip to the supermarket. Portobello mushroom caps are large and meaty, perfect for stuffing, while fresh spinach adds a vibrant green color and a nutritious boost to the filling. Make sure to also pick up some mozzarella cheese and parmesan cheese for that melty, cheesy goodness.

Ingredients For Stuffed Grilled Portobello Mushroom Caps
Portobello mushroom caps: Large, meaty mushrooms perfect for stuffing.
Spinach: Fresh or frozen, adds a nutritious and vibrant green element.
Diced tomatoes: Drained, providing a juicy and tangy flavor.
Mozzarella cheese: Shredded, melts beautifully to create a gooey texture.
Parmesan cheese: Grated, adds a sharp and nutty flavor.
Garlic: Minced, infuses the filling with a robust aroma.
Olive oil: Used to bind the filling and add richness.
Salt: Enhances the overall flavor.
Pepper: Adds a touch of heat and depth.
Technique Tip for Making Stuffed Grilled Portobello Mushrooms
When preparing portobello mushroom caps, it's essential to remove the gills from the underside of the mushrooms. Use a spoon to gently scrape them out. This not only creates more space for the stuffing but also prevents the mushrooms from becoming too watery during grilling.
Suggested Side Dishes
Alternative Ingredients
portobello mushroom caps - Substitute with large cremini mushrooms: They have a similar texture and flavor, making them a good alternative for stuffing and grilling.
fresh or frozen chopped spinach - Substitute with kale: Kale provides a similar leafy texture and can be used fresh or cooked, adding a slightly different but complementary flavor.
drained diced tomatoes - Substitute with sun-dried tomatoes: Sun-dried tomatoes offer a more intense flavor and a chewy texture, adding a different dimension to the dish.
shredded mozzarella cheese - Substitute with shredded provolone cheese: Provolone melts well and has a slightly sharper flavor, which can enhance the overall taste of the stuffed mushrooms.
grated parmesan cheese - Substitute with grated pecorino romano: Pecorino romano is a bit saltier and has a more robust flavor, making it a good alternative to parmesan.
minced garlic - Substitute with garlic powder: Garlic powder can be used in place of fresh garlic, though it will have a slightly different intensity and texture.
olive oil - Substitute with avocado oil: Avocado oil has a high smoke point and a mild flavor, making it a suitable replacement for olive oil in grilling.
salt - Substitute with soy sauce: Soy sauce can add a salty and umami flavor, providing a different but interesting taste profile.
pepper - Substitute with cayenne pepper: Cayenne pepper adds a bit of heat and a different kind of spiciness, which can enhance the overall flavor of the dish.
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How to Store / Freeze Your Stuffed Grilled Portobello Mushrooms
- Allow the stuffed mushrooms to cool completely before storing to prevent condensation, which can make them soggy.
- Place the cooled stuffed mushrooms in an airtight container. If stacking them, separate layers with parchment paper to avoid sticking.
- Store in the refrigerator for up to 3 days. Reheat in the oven at 350°F (175°C) for about 10-15 minutes or until heated through.
- For freezing, wrap each stuffed mushroom individually in plastic wrap to maintain their shape and prevent freezer burn.
- Place the wrapped stuffed mushrooms in a freezer-safe bag or container, ensuring to remove as much air as possible.
- Label the container with the date and contents for easy identification.
- Freeze for up to 2 months. When ready to eat, thaw in the refrigerator overnight.
- Reheat in the oven at 350°F (175°C) for 20-25 minutes or until thoroughly heated and the cheese is bubbly.
How to Reheat Leftovers
Oven Method:
- Preheat your oven to 350°F (175°C).
- Place the stuffed mushrooms on a baking sheet.
- Cover them loosely with aluminum foil to prevent the cheese from over-browning.
- Bake for about 10-15 minutes, or until the mushrooms are heated through and the cheese is bubbly.
Microwave Method:
- Place the stuffed mushrooms on a microwave-safe plate.
- Cover them with a microwave-safe lid or another plate to retain moisture.
- Microwave on medium power for 1-2 minutes, checking halfway through to ensure even heating.
- Continue microwaving in 30-second intervals until thoroughly heated.
Stovetop Method:
- Heat a non-stick skillet over medium heat.
- Add a small amount of olive oil or butter to the skillet.
- Place the stuffed mushrooms in the skillet, cover with a lid, and cook for about 5-7 minutes.
- Turn them occasionally to ensure even heating and prevent burning.
Air Fryer Method:
- Preheat your air fryer to 350°F (175°C).
- Place the stuffed mushrooms in the air fryer basket.
- Cook for 5-7 minutes, checking halfway through to ensure they are heating evenly.
- Continue cooking until the mushrooms are hot and the cheese is melted and bubbly.
Best Tools for Making Stuffed Grilled Portobello Mushrooms
Grill: Used to cook the stuffed portobello mushroom caps to achieve a tender texture and melted, bubbly cheese.
Mixing bowl: Used to combine the spinach, tomatoes, mozzarella, parmesan, garlic, and olive oil.
Measuring cups: Used to measure out the spinach, diced tomatoes, mozzarella cheese, and parmesan cheese accurately.
Measuring spoons: Used to measure the olive oil and seasonings like salt and pepper.
Garlic press: Used to mince the garlic cloves efficiently.
Spoon: Used to stuff the mushroom caps with the spinach and cheese mixture.
Tongs: Used to handle the mushroom caps on the grill safely.
Cutting board: Used as a surface to chop the spinach and dice the tomatoes if using fresh ones.
Knife: Used to chop the spinach and dice the tomatoes if using fresh ones.
Plate: Used to serve the hot, stuffed grilled portobello mushroom caps.
How to Save Time on Making Stuffed Grilled Portobello Mushrooms
Prepare the filling in advance: Mix the spinach, tomatoes, cheeses, garlic, and olive oil ahead of time and store in the fridge.
Use pre-chopped ingredients: Opt for pre-chopped spinach and diced tomatoes to save prep time.
Preheat the grill: Ensure the grill is preheated to medium-high heat before starting to cook.
Line the grill: Use a grill mat or foil to prevent the mushrooms from sticking and make cleanup easier.
Batch cooking: Grill extra stuffed mushrooms and store leftovers for a quick meal later.

Stuffed Grilled Portobello Mushroom Caps
Ingredients
Main Ingredients
- 4 large Portobello mushroom caps
- 1 cup Chopped spinach fresh or frozen
- ½ cup Diced tomatoes drained
- ½ cup Shredded mozzarella cheese
- ¼ cup Grated Parmesan cheese
- 2 cloves Garlic minced
- 1 tablespoon Olive oil
- to taste Salt and pepper
Instructions
- Preheat the grill to medium-high heat.
- In a mixing bowl, combine spinach, tomatoes, mozzarella, Parmesan, garlic, and olive oil. Season with salt and pepper.
- Stuff the mushroom caps with the mixture.
- Grill the stuffed mushrooms for about 15-20 minutes, until the mushrooms are tender and the cheese is melted and bubbly.
- Serve hot.
Nutritional Value
Keywords
Suggested Appetizers and Desserts for This Recipe
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