Chop ¾ of the mushrooms small enough to melt into the meat. I pretty much dice them. Slice the remaining mushrooms. Set aside.
8 oz baby bella mushrooms
Mix the beef with the diced mushrooms, egg, 1 teaspoon of the dried thyme, minced onion, and a pinch of salt and pepper. Form into eight patties.
1 lb lean ground beef, 2 teaspoon dried thyme, 2 tablespoon dried minced onions, Salt and black pepper, 1 large egg
Heat about ½ of the oil in a large skillet over medium-high heat. Brown the patties, cooking about 3 minutes a side. Remove the patties from the skillet and set aside.
1 tablespoon olive oil
Add the remaining oil to the skillet and saute the sliced mushrooms. Sprinkle them with the remaining 1 teaspoon of dried thyme and 1 teaspoon of garlic powder.
1 teaspoon garlic powder
While the mushrooms are cooking, whisk the Worcestershire sauce, soy sauce, oat flour, and chicken broth together. Add the broth mixture to the mushrooms and bring to a slow boil allowing it to thicken into a gravy.
2 tablespoon Worcestershire sauce, 1 tablespoon soy sauce, 30 g oat flour, 2 cup chicken broth
Add the patties back into the skillet, coating them with the gravy. Cover and cook for an additional 10 minutes or so allowing the flavors to merge and the beef to cook completely.