Mar 02

Roasted Vegetable Sandwich with Avocado-Basil Aioli

Roasted Vegetable Sandwich with Avocado-Basil Aioli







Sink-your-teeth-in tasty.

Roasted Vegetable Sandwich with Avocado-Basil Aioli

This roasted vegetable sandwich feels rather burger-like in look and heartiness. But don’t be fooled. It’s nothing more nor less than a stack of roasted vegetables slathered with a creamy avocado-basil aioli and jazzed up with a frilly piece of butter lettuce. Roasted portobello caps serve as buns, and roasted zucchini, tomatoes, red onion, and red peppers are piled high within to yield layers of flavor and texture. The “buns” are slathered with an avocado-basil aioli, which is simply avocado, basil, garlic, lemon juice, and a pinch of salt that have been tossed into a food processor and blended into a creamy sauce.

The great part about this sandwich is that all of the veggies get roasted in the oven at the same time, portobello caps included. This means that you can whip together the aioli, wash your prettiest lettuce leaves, and set the table all while the vegetables are roasting. Once the veggies are ready, you’ll slather the aioli on the portobello buns, toss on some lettuce, and pile on the zucchini, tomatoes, onions, and red peppers.

Stick a toothpick in it, it’s done.

Roasted Vegetable Sandwich with Avocado-Basil Aioli

Roasted Vegetable Sandwich with Avocado-Basil Aioli

Roasted Vegetable Sandwich with Avocado-Basil Aioli

5.0 from 2 reviews
Roasted Vegetable Sandwich with Avocado-Basil Aioli
Prep time
Cook time
Total time
Recipe type: Sandwich
Serves: 2 sandwiches
For the Buns
  • 4 large portobello mushroom caps
  • sea salt
  • black pepper
For the Roasted Vegetables
  • 1 vine-ripe tomato, sliced into ⅓-inch-thick rounds
  • ½ jar roasted red peppers
  • 1 medium zucchini, ends trimmed, halved, and sliced lengthwise
  • 1 small red onion, peeled and sliced into ½-inch-thick rounds
  • ½ jar roasted red peppers, sliced into 2-inch strips
For the Avocado-Basil Aioli
  • 1 avocado, pitted
  • ⅓ cup fresh basil leaves
  • 1 tablespoon fresh lemon juice
  • 1 garlic clove, peeled
  • ¼ teaspoon sea salt or to taste
For Garnishing
  • 4 butter lettuce or romaine leaves, washed and roughly torn
  1. Preheat oven to 400F.
  2. Clean, de-stem, and scoop out the gills of the portobello mushrooms. Place all four, gill-side-down, on a large baking sheet lined with parchment pepper. Sprinkle with the tops with salt and pepper and roast for 20-25 minutes or until tender.
  3. At the same time, add the tomatoes, zucchini, and red onion to a pan lined with parchment paper, and sprinkle with sea salt and black pepper. Bake alongside the mushrooms for 20-25 minutes or until tender, flip halfway through and season other side of veggies with black pepper and sea salt.
For the Avocado-Basil Mayo
  1. Add the avocado flesh, basil leaves, garlic, lemon juice, and sea salt to a food processor. Process for 2-3 minutes or until smooth, stopping as needed to scrape down the sides.
To Assemble
  1. Slather the gill-side of all 4 mushroom caps with the avocado-basil aioli. On two of the portobello caps, layer the lettuce leaves, zucchini, tomatoes, red onion, and roasted red peppers. Top with the other portobello caps, and serve.




  1. That looks delicious. I’m a carb ho, so I’ll be putting that baby on a bun!

    • Haha, I love this comment. I’m also a huge carb lover, so I hear you on the bun. I would throw a portobello or two into the bun with the other veggies too. I hope you enjoy it, Emjay!

  2. My mouth is watering looking at the photo! I will be making this before the week is over. Love the fact that the vegetables get roasted all at the same time. Thank you!

    • Roasting all the vegetables at once really keeps this one simple and time-efficient. I hope you enjoy the recipe!

  3. You have no idea how excited I am to try these!! I have some extra portobellos on hand and will need to make these ASAP!

  4. I have to try this veggie sandwich recipe out – i am obsessed with the idea of using mushrooms as a burger bun base!

    • You have to try it, Thalia! It makes for a nice, light lunch, which is great for those days when there is too much to be done to risk a case of post-lunch sleepiness.

  5. oh i saw this on pinterest before i saw it hear and it had my love at first glance. love me a good stack of veggies. xo

  6. Ahh, that looks amazing!

  7. This looks amazing, I’m going to make it tonight! What’s it like cold, would love to take it to work for lunch?

    • Ashley says:

      Hi, Nala! It’s good cold too, you’ll just want to make sure you prepare the avocado-basil aioli the same day that you’re eating it since avocado browns and turns so quickly. I hope you enjoy it!


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