Roasted Portobello Mushroom Bun "Burger" 5 Roasted Portobello Mushroom Buns

Roasted Portobello Mushroom Bun “Burger”

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Step into the realm of exquisite flavors as we unveil a delightful new recipe! In this culinary exploration, we delve into the realm of nourishing plant-based cuisine with our captivating Roasted Portobello Mushroom Bun “Burger.” This delectable masterpiece transcends dietary labels, appealing not only to vegetarians and vegans but to all those in pursuit of a meal that harmonizes taste and nutrition. Whether you’re on a journey to embrace more plant-forward choices, broaden your culinary horizons, or savor the rich notes of umami, this recipe promises an incredibly gratifying dining affair.


Years ago, before discovering I had a gluten intolerance in 2009, the idea of a burger without a bun seemed incomplete to me. It felt like I was missing a crucial part of the whole burger-eating experience. But times have changed, and my perspective has evolved. These days, going for a bun-less burger has become the new normal for me. To be honest, I’m not really a fan of gluten-free breads. They lack that appealing rustic taste and the vibrant character of their gluten-filled counterparts. Not to mention, they tend to be denser in terms of calories and carbs. What I’ve come to realize is that a fantastic burger doesn’t necessarily need traditional bread. It just needs something to hold it together, making it both convenient and delightfully messy to enjoy. That’s why I’m absolutely thrilled to introduce you to this incredibly savory and delicious recipe–Roasted Portobello Mushroom Buns. This dish is a burst of flavor and goodness, and the best part is that it’s both wholesome and super simple to prepare.

There’s something so satisfying about the substantial texture of roasted portobello mushrooms. However, there are times when I’m short on time or simply not in the mood to marinate them before popping them into the oven. The good news is that a quick and efficient method works wonders. Thanks to their flat shape and versatility, these mushroom caps can be utilized as a creative “bread” option for those following a gluten-free, Paleo, or vegan diet.

Oh, and did I mention that this recipe is an excellent choice for a Meatless Monday dinner? Yes, you heard it right. So go ahead and savor every bite!

Roasted Portobello Mushroom Buns

Roasted Portobello Mushroom Buns

Who Is This Recipe For?

This recipe is perfect for those who appreciate the joys of a good burger but are open to exploring creative alternatives. It’s an excellent choice for individuals following vegetarian, vegan, or plant-based diets. Even committed carnivores will find themselves drawn to this burger’s unique combination of flavors and textures. So, whether you’re a seasoned plant-based enthusiast or a curious food lover looking to try something new, this recipe offers something special.

The Greatness of the Roasted Portobello Mushroom “Burger”

The Roasted Portobello Mushroom Bun “Burger” is a culinary masterpiece that brings together a symphony of tastes and textures. Portobello mushrooms, known for their meaty texture and rich flavor, take center stage as the “bun,” offering a satisfying, savory and filling bite. Paired with a medley of fresh ingredients and thoughtful seasonings, this burger boasts an umami profile that’s hard to resist.

Roasted Portobello Mushroom Buns

Roasted Portobello Mushroom Bun “Burger” Recipe

Recipe makes 2.

Ingredients You’ll Need

  • 4 large Portobello mushrooms
  • 1 tablespoon olive oil
  • 1 tablespoon coconut aminos
  • Sea salt
  • Freshly ground pepper
  • 1 tomato, sliced
  • 1/2 purple onion, sliced
  • Tuscan kale leaves (or your favorite leafy green)
  • 1 avocado
  • Juice from 1/2 lemon
  • Mayo, to taste (or vegan mayo)

Step-by-Step Instructions

  1. Preheat the Oven: Begin by preheating your oven to 400°F. Line a baking sheet with aluminum foil and place it on the middle rack.
  2. Prepare the Mushrooms: Wipe the Portobello mushrooms clean with a damp cloth or paper towel. Remove the stems and brush both sides of the caps with a mixture of olive oil and coconut aminos. This blend adds a delightful umami flavor and helps achieve a perfect roasted texture.
  3. Roast the Mushrooms: Arrange the mushrooms gill side up on the baking sheet. Roast them for 10 minutes, then flip them over and roast for an additional 10 minutes. Once done, transfer the mushrooms to a plate to allow them to dry slightly.
  4. Mash the Avocado: While the mushrooms are roasting, mash the avocado in a bowl and mix in the juice from half a lemon. This creamy avocado spread will add a burst of freshness to your burger.
  5. Assemble the “Burger”: If desired, spread a dollop of mayo on one mushroom cap. Then layer on the mashed avocado, sliced tomato, purple onion, and Tuscan kale leaves. Top with another mushroom cap to complete your “burger.”


Kitchen Equipment Needed

  • Oven
  • Baking sheet
  • Aluminum foil
  • Mixing bowl
  • Brush for oil and coconut aminos mixture

Recipe Variations and Tips

  • Cheesy Twist: If you’re a cheese lover, consider adding a slice of your favorite vegan cheese to your “burger” stack. Melt it slightly by placing the assembled burger under the broiler for a minute or two.
  • Flavor Explosion: Experiment with different seasonings for your avocado spread. A pinch of garlic powder or a dash of hot sauce can elevate the flavor profile.

Storing Leftovers

If you find yourself with leftover mushrooms or assembled burgers, store them separately in airtight containers in the refrigerator. The roasted mushrooms can be reheated in the oven or a toaster oven to maintain their texture. Assembled burgers are best stored unassembled, with the various components kept separate until you’re ready to enjoy them.

Food and Drink Pairings

Pair your Roasted Portobello Mushroom Bun “Burger” with a crisp side salad, sweet potato fries, or even a hearty bowl of soup. For a refreshing drink, homemade lemonade or a fruity herbal iced tea complements the flavors perfectly.

Roasted Portobello Mushroom Buns

Roasted Portobello Mushroom Buns

Last Bite

The Roasted Portobello Mushroom Bun “Burger” is a culinary adventure showcasing plant-based cuisine’s versatility and deliciousness. Its robust flavors, wholesome ingredients, and satisfying textures make it a must-try for anyone seeking a mouthwatering and nourishing meal. So, why wait? Embark on this gastronomic journey, and be sure to share your culinary triumphs with friends and family. Don’t forget to subscribe to our blog for more delectable recipes and culinary inspiration!

Hi, I’m Valerie!

I'm an Integrative Nutrition Health Coach and Registered Yoga Teacher (RYT-200), offering guidance to high achievers in aligning their lifestyle with well-being through daily wellness and self-care routines, promoting balance and harmony. Join me at Wellness Bum for tips on living well, and consider subscribing to my newsletter or booking a coaching session.