Mushroom Swiss Burger with Caramelized Onions (Printable)

Juicy beef burgers with sautéed mushrooms, melted Swiss cheese, and sweet caramelized onions on toasted buns.

# What You'll Need:

→ Caramelized Onions

01 - 2 large yellow onions, thinly sliced
02 - 2 tablespoons unsalted butter
03 - 1 tablespoon olive oil
04 - 1/2 teaspoon salt
05 - 1 teaspoon balsamic vinegar (optional)

→ Sautéed Mushrooms

06 - 9 oz cremini or button mushrooms, sliced
07 - 1 tablespoon unsalted butter
08 - 1 tablespoon olive oil
09 - 1 clove garlic, minced
10 - 1/4 teaspoon salt
11 - 1/4 teaspoon black pepper
12 - 1 teaspoon fresh thyme leaves (optional)

→ Burgers

13 - 1.3 lbs ground beef (80% lean)
14 - 1/2 teaspoon salt
15 - 1/2 teaspoon black pepper
16 - 4 slices Swiss cheese
17 - 4 burger buns, split and toasted
18 - 2 tablespoons mayonnaise (optional)
19 - 1 tablespoon Dijon mustard (optional)
20 - Lettuce leaves (optional)

# How-To Steps:

01 - In a large skillet over medium heat, melt butter with olive oil. Add sliced onions and salt. Cook, stirring occasionally, until onions are deeply golden and caramelized, about 18–20 minutes. Add balsamic vinegar (if using) in the last minute. Remove from skillet and set aside.
02 - In the same skillet, melt butter with olive oil over medium-high heat. Add mushrooms and cook, stirring occasionally, until browned and their moisture has evaporated, about 6–8 minutes. Stir in garlic, salt, pepper, and thyme. Sauté for another 1–2 minutes. Remove from heat.
03 - Divide ground beef into 4 equal portions and gently shape into patties slightly larger than your buns. Season both sides with salt and pepper.
04 - Heat a grill, grill pan, or skillet over medium-high heat. Cook patties for 3–4 minutes per side (for medium), or until desired doneness. In the last minute, place a slice of Swiss cheese on each patty, cover, and let melt.
05 - Spread mayonnaise and mustard on the cut sides of toasted buns if desired. Place lettuce on the bottom bun, add the burger patty with melted Swiss cheese, top with sautéed mushrooms and caramelized onions. Finish with the top bun.
06 - Serve immediately with your favorite side.

# Expert Advice:

01 -
  • The combination of sweet onions and earthy mushrooms creates layers of flavor that make every bite interesting
  • Melting Swiss cheese over everything acts as the delicious glue holding this gourmet masterpiece together
  • Restaurant quality results without requiring any fancy techniques or equipment
02 -
  • Rushing the caramelized onions is the biggest mistake you can make with this recipe
  • Overcrowding the pan when cooking mushrooms will cause them to steam instead of brown
  • Letting the burgers rest for even 2 minutes after cooking helps them retain their juices
03 -
  • Make a small indentation in the center of each raw patty to prevent them from puffing up into balls while cooking
  • Let your ground beef come to room temperature for 20 minutes before cooking for even heating

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