Portobello mushroom burgers are a fantastic vegetarian alternative that doesn't skimp on flavor. These hearty mushrooms soak up a delicious marinade and grill to perfection, making them a satisfying and healthy option for any meal.
Portobello mushrooms might not be a staple in every household, but they are readily available in most supermarkets. Look for large, firm caps with a smooth surface. Balsamic vinegar is another ingredient that might not be in everyone's pantry, but it adds a rich, tangy flavor to the marinade that complements the mushrooms beautifully.

Ingredients for Portobello Mushroom Burger Recipe
Portobello mushroom caps: These large, meaty mushrooms are the star of the dish, providing a hearty texture and rich flavor.
Olive oil: Used to create the marinade, it helps to keep the mushrooms moist and adds a subtle richness.
Balsamic vinegar: Adds a tangy, slightly sweet flavor that enhances the natural taste of the mushrooms.
Dried basil: Provides a hint of herbal aroma and flavor to the marinade.
Dried oregano: Adds a slightly bitter, earthy flavor that complements the other ingredients.
Burger buns: The base for your burger, choose your favorite type of buns to suit your taste.
Cheese: Optional, but adds a creamy, melty layer to the burger if desired.
Technique Tip for This Recipe
When preparing portobello mushroom caps, make sure to remove the stems and gently scrape out the gills with a spoon. This will help the marinade penetrate better and ensure even cooking. Additionally, to prevent the burger buns from becoming soggy, lightly toast them on the grill for a minute or two before assembling the burgers.
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 a mushroom burger.
olive oil - Substitute with avocado oil: Avocado oil has a high smoke point and a mild flavor, suitable for grilling mushrooms.
balsamic vinegar - Substitute with red wine vinegar: Red wine vinegar provides a tangy flavor that complements the mushrooms well.
dried basil - Substitute with fresh basil: Fresh basil offers a more vibrant and aromatic flavor compared to dried basil.
dried oregano - Substitute with fresh oregano: Fresh oregano has a more intense and aromatic flavor, enhancing the overall taste of the burger.
burger buns - Substitute with whole wheat buns: Whole wheat buns add a nutty flavor and extra fiber, making the burger healthier.
cheese - Substitute with vegan cheese: Vegan cheese is a good alternative for those who are lactose intolerant or following a plant-based diet.
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How to Store or Freeze Your Portobello Mushroom Burger
Allow the portobello mushroom caps to cool completely after grilling. This ensures that condensation doesn't form inside the storage container, which could make the mushrooms soggy.
Place the cooled mushrooms in an airtight container. If you have multiple layers of mushrooms, separate each layer with a piece of parchment paper to prevent sticking.
Store the container in the refrigerator. The grilled mushrooms will stay fresh for up to 3-4 days.
If you wish to freeze the mushrooms, first lay them out on a baking sheet in a single layer. Place the baking sheet in the freezer for about 1-2 hours, or until the mushrooms are frozen solid. This prevents them from sticking together.
Once frozen, transfer the mushrooms to a freezer-safe bag or container. Label the container with the date to keep track of freshness. The mushrooms can be frozen for up to 2 months.
When ready to use, thaw the mushrooms in the refrigerator overnight. Reheat them on the grill or in a skillet over medium heat until warmed through.
For the burger buns, store them in a bread box or airtight container at room temperature for up to 3 days. If you need to store them longer, place them in a freezer-safe bag and freeze for up to 1 month. Thaw at room temperature before using.
If you have leftover cheese, wrap it tightly in plastic wrap or store it in an airtight container in the refrigerator. Cheese can also be frozen, but it may change in texture.
How to Reheat Leftovers
Preheat your oven to 350°F (175°C). Place the portobello mushroom caps on a baking sheet lined with parchment paper. Cover them loosely with aluminum foil to prevent drying out. Heat for about 10-15 minutes or until warmed through.
Use a skillet to reheat. Add a splash of olive oil to the skillet and heat over medium heat. Place the portobello mushrooms in the skillet and cover with a lid. Cook for about 3-5 minutes on each side, or until heated through.
For a quick microwave method, place the portobello mushrooms on a microwave-safe plate. Cover with a microwave-safe lid or another plate to trap steam. Heat on medium power for 1-2 minutes, checking halfway through to ensure they don't overcook.
If you have an air fryer, preheat it to 350°F (175°C). Place the portobello mushrooms in the air fryer basket and heat for about 5-7 minutes, shaking the basket halfway through to ensure even heating.
To reheat the burger buns, wrap them in aluminum foil and place them in the oven at 350°F (175°C) for about 5 minutes, or until warm. Alternatively, you can lightly toast them in a skillet over medium heat for 1-2 minutes per side.
If you have leftover cheese on the mushrooms, you can place them under a broiler for 1-2 minutes to melt the cheese and warm the mushrooms simultaneously. Keep a close eye to avoid burning.
Essential Tools for This Recipe
Grill: Used to cook the portobello mushroom caps, providing a smoky flavor and char marks.
Mixing bowl: Used to combine the olive oil, balsamic vinegar, basil, and oregano.
Basting brush: Used to brush the marinade mixture onto both sides of the portobello mushroom caps.
Tongs: Used to place the mushrooms on the grill and flip them during cooking.
Spatula: Used to handle the mushrooms and cheese slices on the grill.
Knife: Used to slice the cheese if not pre-sliced and to cut any additional toppings.
Cutting board: Used as a surface for slicing cheese and other toppings.
Plates: Used to assemble and serve the burgers.
Measuring spoons: Used to measure out the olive oil, balsamic vinegar, basil, and oregano.
Time-Saving Tips for Making This Recipe
Prepare the marinade ahead: Mix the olive oil, balsamic vinegar, basil, and oregano the night before to save time.
Preheat the grill: Start preheating the grill while you prepare the mushrooms to streamline the process.
Use pre-sliced cheese: If using cheese, buy pre-sliced to avoid extra prep work.
Assemble toppings in advance: Prepare and set aside your desired toppings like lettuce, tomato, and onions before starting to grill.
Toast buns on the grill: Toast the burger buns on the grill during the last few minutes of cooking the mushrooms to save time and add flavor.

Portobello Mushroom Burger
Ingredients
Main Ingredients
- 4 Portobello mushroom caps
- 2 tablespoon Olive oil
- 1 tablespoon Balsamic vinegar
- 1 teaspoon Dried basil
- 1 teaspoon Dried oregano
- 4 Burger buns
- 4 slices Cheese (optional)
- Lettuce, tomato, onion (for topping)
Instructions
- 1. Preheat grill to medium-high heat.
- 2. In a mixing bowl, combine olive oil, balsamic vinegar, basil, and oregano.
- 3. Brush the mixture onto both sides of the portobello mushroom caps.
- 4. Place mushrooms on the grill, gill side down, and cook for about 5-7 minutes per side.
- 5. If using cheese, add a slice to each mushroom cap during the last minute of grilling.
- 6. Assemble the burgers with buns, grilled mushrooms, and desired toppings.
Nutritional Value
Keywords
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