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Mushroom Swiss Burger with Caramelized Onions Recipe

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3.9 from 3 reviews

  • Author: Sara
  • Total Time: 1 hour 10 minutes
  • Yield: 4 servings

Description

This Mushroom Swiss Burger with Caramelized Onions recipe delivers a flavorful twist on a classic beef burger. Featuring slowly caramelized onions, sautéed crimini mushrooms, melted Swiss cheese, and fresh brioche buns, this dish combines rich and savory flavors in every bite. Perfectly seared beef patties topped with creamy Swiss cheese and fresh lettuce make for a satisfying meal that takes about an hour to prepare, ideal for a hearty dinner or weekend treat.

Ingredients

For the Caramelized Onions

  • 1 ½ tablespoons butter (plus more for buns)
  • 2 large yellow onions, vertically sliced
  • 1 teaspoon salt, divided

For the Patties and Mushrooms

  • 1 ½ lb lean ground beef
  • 1 tablespoon olive oil
  • 8 ounces crimini mushrooms, sliced
  • 4 thick slices Swiss cheese

For Assembly

  • 4 brioche buns
  • Mayonnaise
  • Butter lettuce

Instructions

  1. Saute onions: Melt butter in a large cast-iron frying pan over medium-high heat. Add the sliced onions and stir. Cook for 8-10 minutes, stirring occasionally, until onions soften.
  2. Caramelize onions: Reduce heat to medium, add ¼ teaspoon salt, and cook the onions slowly for 30-50 minutes, stirring occasionally. Add a splash of water if onions or fond brown too quickly to prevent burning, cooking until onions reach desired caramelization.
  3. Prep ingredients: While onions cook, slice the mushrooms and shape the ground beef into four even patties.
  4. Cook mushrooms: When onions are golden, remove them from the pan. Increase heat to medium, add olive oil and mushrooms. Cook, stirring occasionally for about 10 minutes until mushrooms soften and start to brown. Season with ¼ teaspoon salt and pepper to taste, then remove mushrooms from pan.
  5. Cook burger patties: Increase heat to medium-high. Place patties in pan and season with remaining ½ teaspoon salt. Cook for 3-4 minutes until a crust forms on the bottom. Flip patties and cook 3-4 more minutes until internal temperature reaches 165°F. Add Swiss cheese slices over patties during last 2 minutes to melt.
  6. Toast buns: Wipe pan clean with paper towel. Butter brioche buns and toast them in the pan in batches until golden.
  7. Assemble burgers: Spread mayonnaise on toasted buns, add butter lettuce, place cheesy burger patty on top, then layer with caramelized onions and sautéed mushrooms. Serve immediately for best flavor and texture.

Notes

  • Slice onions vertically for even caramelization.
  • If fond darkens too fast during onion caramelization, add water to prevent burning.
  • Use a meat thermometer to ensure patties reach safe internal temperature of 165°F.
  • Butter the buns before toasting to enhance flavor and achieve crispness.
  • Swiss cheese melts best if added towards the end of cooking while the burgers rest briefly in the pan.
  • Prep Time: 20 minutes
  • Cook Time: 50 minutes
  • Category: Main Course
  • Method: Frying
  • Cuisine: American

Find it online: https://sarabaking.com/mushroom-swiss-burger-with-caramelized-onions-recipe/