Mushroom Swiss Burger Ultimate Umami Recipe with Thyme

Ingredients

• 2 Tbsp Unsalted Butter
• 1 lb Mixed Mushrooms (Cremini/Portobello), sliced thinly
• 2 cloves Garlic, minced finely
• 1 tsp Fresh Thyme Leaves, chopped
• 2 Tbsp Dry Red Wine or Sherry (optional, for deglazing)
• Salt & Black Pepper, to taste
• 5 lb Ground Beef (80/20 Chuck)
• 1 tsp Worcestershire Sauce
• 1/2 tsp Onion Powder
• 4 slices Swiss Cheese (Emmentaler or Gruyère)
• 1 Tbsp Neutral Oil (Canola or Vegetable)
• 4 Brioche Buns or Seeded Baps, split and toasted
• Mayonnaise (Optional)
• Dijon Mustard (Optional)