---
title: Mega Mushroom Burgers
servings: 4
source:
  name: HelloFresh
  url: https://www.hellofresh.com/recipes/w22-r9-58f0cf5951d3f11a4d4888f2
prep time: 15 minutes
cook time: 15 minutes
time required: 30 minutes
difficulty: easy
allergens:
  - Eggs
  - Wheat
  - Soy
tags:
  - Spicy
rating: 4.0
rating_count: 845
source_chef: Recipe Development Team
review_highlights: []
nutrition:
  calories: 640
  protein: 13
  fat: 40
  saturated fat: 7
  carbohydrates: 62
  sugar: 15
  fiber: 11
  cholesterol: 15
  sodium: 490
image: "https://images.recipes.furrysalamander.com/American%20Recipes/Burgers/mega-mushroom-burgers.avif"
---

Wash and dry all produce. Peel @yellow onion{2}, then thinly slice crosswise and separate into rings. Slice @roma tomato{2} into thin rounds. In a #small bowl{}, combine @mayonnaise{4} and @hot sauce{4} (to taste).

Heat a drizzle of @olive oil{8} in a #large pan{} over medium heat. Add onion and cook, tossing, until softened and browned, ~{5%minutes}. Season with @salt{} and @pepper{}.

Rub @portobello mushrooms{4} all over with a large drizzle of olive oil. Season with salt and pepper. Add to the same #large pan{} over medium heat. Cook until just tender, ~{4%minutes} per side. Pour 1½ TBSP @balsamic vinegar{4} into the pan (we sent more) and cook until reduced by half. Toss to coat the mushrooms, then remove from pan and set aside.

Wash and dry the same #large pan{}, then return to stove over medium heat. Split @potato buns{4} in half down center. Add to pan cut side down. Toast until golden brown, ~{4%minutes}.

Halve @avocado{2}, pit, and scoop flesh from it, then roughly chop. Place in a #small bowl{} and mash until mostly smooth. Season with salt and pepper.

In a #medium bowl{}, toss @arugula{4} with a drizzle of olive oil, remaining balsamic vinegar, and a pinch of salt and pepper. Spread the spicy mayo on the buns, then add a mushroom to each bun. Top with tomato, onion, and avocado. Serve with the salad to the side.