These grilled Portobello Mushroom Burgers topped with mozzarella, red peppers, and pesto mayo, are delicious and an excellent vegetarian burger option.

Portobello Burger with Mozzarella

Who doesn’t love a good hamburger? I know I do! But I also love going meatless and really enjoy these Portobello Burgers, especially with pesto mayo and mozzarella, so good!! These are a variation of this Grilled Portobello Mushroom Burger recipe. I marinate and grill the mushrooms and top them with mozzarella, grilled red onions, roasted peppers, and an easy pesto mayonnaise sauce. For some other veggie burger ideas, try my Spicy Black Bean Burgers and Houston’s Veggie Burgers.

Portobello mushrooms are a great meat substitute if you’re trying to reduce your calories or red-meat consumption. Portobellos have a meaty texture and flavor that I enhance with a simple marinade made of balsamic vinegar, soy sauce, olive oil, and Montreal steak seasoning.

How do you prepare portobello mushrooms?

To prep portobellos for cooking, pop off the stems and wipe the tops of the mushrooms off with a paper towel. You can remove the gills on the inside of the mushrooms if you want, but it’s not necessary as they are edible.

What to Serve with Portobello Mushroom Burgers

These portobello burgers would be delicious with a salad like my Italian Chopped Salad or Summer Tomato Salad. You could also serve them with Air Fryer French Fries or Skinny Garlic Parmesan Fries.

Portobello Mushroom Burger Tips &  Variations:

• If you don’t have a grill, cook the mushrooms on a grill pan or cast-iron skillet on your stove.
• If you’d like to use homemade pesto for the sauce, try my Skinny Basil Pesto.
• Swap the mozzarella for provolone cheese.
• If you prefer meat, use lean ground beef or turkey patties instead of mushrooms and top with all the same toppings.

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