I can’t get enough of these juicy grilled portobello mushrooms stuffed with melty mozzarella, sweet tomatoes, fresh basil, and glossy balsamic glaze. They’re bold, fresh, and so satisfying, you may forget they started as mushrooms.

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I’m obsessed with these Grilled Portobello Mushrooms Caprese because they hit that juicy, smoky, tangy spot I crave when I want something big on flavor but not fussy. The Portobello mushroom caps get me every time, meaty in the best way, with those savory edges that taste like they came straight from a backyard grill session.

Then comes the fresh mozzarella, all creamy and melty, and I’m done. Absolutely done.

And that glossy finish? I could put it on everything.

But here, it just works. Simple, bold, messy in the right way, and all satisfying for dinner, snacking, or sharing.

Ingredients

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Portobellos bring the meaty bite, so you won’t miss a heavy main.
Olive oil helps everything grill up juicy, glossy, and not sad.
Balsamic vinegar adds tangy sweetness that plays really well with mushrooms.
Lemon juice keeps it bright, fresh, and a little zippy.
Garlic gives that cozy, savory kick you’ll smell right away.
Oregano adds an herby pizza-ish vibe, which is never bad.
Salt wakes everything up, because bland mushrooms are just rude.
Black pepper adds a tiny bite without taking over.
Fresh mozzarella melts softly and makes the whole thing feel Caprese.
Cherry tomatoes bring juicy pops, sweetness, and that summer salad energy.
Basil makes it fresh, fragrant, and honestly kind of pretty.
Balsamic glaze finishes it sticky, sweet, and restaurant-looking.
Plus, a little grill oil helps prevent mushroom heartbreak.

Ingredient Quantities

4 large Portobello mushroom caps, stems removed and gills scraped

3 tablespoons extra virgin olive oil

2 tablespoons balsamic vinegar

1 tablespoon lemon juice

2 garlic cloves, minced

1 teaspoon dried oregano or 1 tablespoon chopped fresh oregano

1 teaspoon kosher salt

1/2 teaspoon freshly ground black pepper

8 ounces fresh mozzarella, sliced or torn into pieces

1 to 1 1/2 cups cherry tomatoes, halved

1/2 cup fresh basil leaves, whole or torn

2 to 3 tablespoons balsamic glaze for drizzling

Optional: cooking spray or extra oil for the grill

How to Make this

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1. In a bowl whisk together 3 tablespoons extra virgin olive oil, 2 tablespoons balsamic vinegar, 1 tablespoon lemon juice, 2 minced garlic cloves, 1 teaspoon dried oregano or 1 tablespoon chopped fresh oregano, 1 teaspoon kosher salt and 1/2 teaspoon freshly ground black pepper to make the marinade.

2. Place 4 large Portobello mushroom caps, stems removed and gills scraped, in a shallow dish and pour half the marinade over them, turning to coat; reserve the other half for basting. Marinate 10 to 30 minutes.

3. Preheat grill to medium heat, about 400 degrees F, and lightly oil the grate with cooking spray or a brush of oil to prevent sticking.

4. Place the mushrooms on the grill gill side down and cook 4 to 6 minutes until they begin to soften and show good grill marks.

5. Brush the exposed tops with some reserved marinade, then flip the mushrooms gill side up and brush the gill cavities with more marinade.

6. Divide 8 ounces fresh mozzarella, sliced or torn, among the 4 mushroom caps, then scatter 1 to 1 1/2 cups halved cherry tomatoes over the cheese.

7. Close the grill lid and cook 2 to 4 minutes more until the mozzarella begins to melt and the tomatoes soften.

8. Remove mushrooms from the grill and immediately tuck or scatter 1/2 cup fresh basil leaves over each cap so the residual heat wilts the basil slightly.

9. Drizzle 2 to 3 tablespoons balsamic glaze over the stuffed mushrooms and give a final spoonful of the reserved marinade if desired for extra flavor.

10. Serve hot as an appetizer, side or light dinner.

Equipment Needed

1. Large mixing bowl
2. Whisk
3. Measuring spoons
4. Shallow dish or large resealable bag for marinating
5. Grill and grill brush or cooking oil spray
6. Tongs and spatula
7. Basting brush
8. Sharp knife and cutting board
9. Small spoon for drizzling or serving

FAQ

How long and at what temperature should I grill the Portobello caps? Grill over medium-high heat, about 375 to 425 F, for 4 to 6 minutes per side until tender and juicy but not collapsed; finish with cheese on top for 1 to 2 minutes to melt.

How do I prevent the mushrooms from getting soggy? Remove stems and scrape gills, pat caps dry, marinate briefly rather than soaking, and grill over direct heat to sear and seal juices.

Can I make this indoors without a grill? Yes. Broil on a rimmed baking sheet 6 to 8 inches from the element for 4 to 6 minutes per side, or roast at 425 F for 12 to 18 minutes, adding mozzarella and broiling briefly to melt.

What can I use instead of fresh mozzarella? Use sliced provolone, burrata for extra creaminess, or a firm vegan mozzarella for a dairy free option; add it at the end so it melts without overcooking the mushroom.

How long can I store leftovers and how should I reheat them? Refrigerate in an airtight container up to 3 days. Reheat gently in a 350 F oven for 8 to 10 minutes or warm in a skillet over low heat until heated through to avoid drying.

How can I make this recipe vegan? Replace mozzarella with a vegan cheese that melts or use a pesto or garlicky bean spread, and use a balsamic glaze that contains no honey.

Grilled Portobello Mushrooms Caprese Recipe Substitutions and Variations

Portobello mushroom caps: use thick eggplant slices or large zucchini steaks grilled until tender for a similar meaty texture.
Extra virgin olive oil: substitute avocado oil or grapeseed oil for high-heat grilling and a neutral flavor.
Balsamic vinegar: swap in red wine vinegar with a teaspoon of honey or maple syrup to mimic balsamic sweetness and acidity.
Fresh mozzarella: replace with burrata for extra creaminess, or with fresh goat cheese for a tangier, spreadable option.

Pro Tips

– Let the mushrooms sit in the marinade at least 20 minutes if you can. They soak up flavor quickly but a little extra time gives deeper taste and a juicier texture without becoming mushy.

– Oil the grill grate and the mushroom caps well, and keep the heat at medium. Too hot and the outside chars before the inside softens; too cool and they steam. Medium heat gives nice grill marks and tender flesh.

– Add the mozzarella toward the end and close the lid for just a couple minutes so it melts without releasing too much liquid. If you want gooey cheese without soggy tomatoes, briefly broil or toast the cheese tops instead of overcooking on the grill.

– Use firm cherry tomatoes and toss them with a pinch of salt and a tiny splash of the reserved marinade before adding. That draws out a touch of sweetness and concentrates flavor without making the filling watery.

– Finish with the basil and balsamic glaze off the heat. The residual warmth will wilt the basil just enough and the glaze will remain glossy and slightly syrupy, giving a bright, balanced finish.

Grilled Portobello Mushrooms Caprese Recipe

Recipe by Francis Mead

0.0 from 0 votes

Servings

servings

Calories

320

kcal

Equipment: 1. Large mixing bowl
2. Whisk
3. Measuring spoons
4. Shallow dish or large resealable bag for marinating
5. Grill and grill brush or cooking oil spray
6. Tongs and spatula
7. Basting brush
8. Sharp knife and cutting board
9. Small spoon for drizzling or serving

Ingredients

4 large Portobello mushroom caps, stems removed and gills scraped
3 tablespoons extra virgin olive oil
2 tablespoons balsamic vinegar
1 tablespoon lemon juice
2 garlic cloves, minced
1 teaspoon dried oregano or 1 tablespoon chopped fresh oregano
1 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
8 ounces fresh mozzarella, sliced or torn into pieces
1 to 1 1/2 cups cherry tomatoes, halved
1/2 cup fresh basil leaves, whole or torn
2 to 3 tablespoons balsamic glaze for drizzling
Optional: cooking spray or extra oil for the grill

Directions

In a bowl whisk together 3 tablespoons extra virgin olive oil, 2 tablespoons balsamic vinegar, 1 tablespoon lemon juice, 2 minced garlic cloves, 1 teaspoon dried oregano or 1 tablespoon chopped fresh oregano, 1 teaspoon kosher salt and 1/2 teaspoon freshly ground black pepper to make the marinade.
Place 4 large Portobello mushroom caps, stems removed and gills scraped, in a shallow dish and pour half the marinade over them, turning to coat; reserve the other half for basting. Marinate 10 to 30 minutes.
Preheat grill to medium heat, about 400 degrees F, and lightly oil the grate with cooking spray or a brush of oil to prevent sticking.
Place the mushrooms on the grill gill side down and cook 4 to 6 minutes until they begin to soften and show good grill marks.
Brush the exposed tops with some reserved marinade, then flip the mushrooms gill side up and brush the gill cavities with more marinade.
Divide 8 ounces fresh mozzarella, sliced or torn, among the 4 mushroom caps, then scatter 1 to 1 1/2 cups halved cherry tomatoes over the cheese.
Close the grill lid and cook 2 to 4 minutes more until the mozzarella begins to melt and the tomatoes soften.
Remove mushrooms from the grill and immediately tuck or scatter 1/2 cup fresh basil leaves over each cap so the residual heat wilts the basil slightly.
Drizzle 2 to 3 tablespoons balsamic glaze over the stuffed mushrooms and give a final spoonful of the reserved marinade if desired for extra flavor.
Serve hot as an appetizer, side or light dinner.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.