Set a heavy skillet over medium heat. Melt ghee
Add mushrooms and cook, stirring occasionally for 3-4 minutes.
Stir in diced onions, cooking for an additional 3-4 minutes. Set aside to cool.
Once the Mushroom Mix cools, combine the ground beef, Italian dried herbs, garlic salt, Worcetershire sauce, and mushroom mix in a large bowl.
Using your hands, mix ingredients until evenly blended. Form into four equal size patties. Set aside.
Wipe out the pan you used to cook mushrooms. Place clean pan back to medium heat and add 1 tablespoon of ghee melt. Add patties to the pan, making sure that they do not touch.
Cook for 5 minutes, flip when pattie is browned and easily release from pan. Cook for an additional 3-4 minutes.Burgers will be done to medium temperature
Add cheese to each burger if using. Turn off heat, cover pan for 1-2 minutes, just until the cheese is melted.
Serve on toasted Sourdough English Muffins.