01 -
Heat unsalted butter and olive oil in a large skillet over medium-high heat until butter is melted. Add sliced mushrooms and Worcestershire sauce, stir to combine, then leave undisturbed for 5 minutes to caramelize.
02 -
Pour in beef broth and cook, letting the liquid evaporate for 8 to 10 minutes. Once reduced, add minced garlic and black pepper, stir, and continue cooking for an additional 3 to 4 minutes. Remove skillet from heat and set mushrooms aside.
03 -
In a large bowl, combine ground beef, steak seasoning, and Worcestershire sauce. Gently mix and shape mixture into four 4-ounce patties.
04 -
Preheat grill to medium-high heat. Place patties on grill grates and cook for 4 to 5 minutes per side, until desired doneness is achieved.
05 -
During the final 1 to 2 minutes of grilling, place one slice of Swiss cheese atop each patty and allow it to melt.
06 -
Lightly toast the hamburger buns on the grill until golden.
07 -
Arrange each cheeseburger on a toasted bun and generously top with sautéed mushrooms. Serve immediately.