Preheat oven to 400º. Add a wire baking rack to a baking sheet and set aside.
In a large bowl, add ground beef, Worcestershire sauce, garlic powder and onion powder.
2 lb ground chuck, 2 tbsp Worcestershire sauce, 2 tsp garlic powder, 2 tsp onion powder
With hands, mix all contents together. Form four large patties about 1.5” thick. Sprinkle both sides of burgers with salt and pepper and set aside.
1 tsp salt, 1/2 tsp black pepper
In a cast-iron pan or heavy-bottom skillet, over medium high heat, add 1 tbsp butter and 1 clove minced garlic. Once butter melts and skillet is hot, add hamburger steak patties.
2 tbsp butter, 3 cloves minced garlic
Turn heat down to medium low and sear for 2 minutes on each side and then set on wire rack on baking sheet. If using a cast iron skillet, you will likely need to cook these in batches - which is fine since they'll finish in the oven. This gives the meat that crispy sear and golden brown coloring.
Place cookie sheet into the preheated oven and bake for 12 minutes until hamburger steaks are cooked through.
While steak patties are baking, in same cast iron skillet with any drippings, add 2 tbsp butter.
2 tbsp butter
When melted, add in garlic, sliced onions, mushrooms and fresh herbs. Sauté until softened, about 3-4 minutes.
1 tbsp minced garlic, 1 large onion, 16 oz button mushrooms, 2-3 sprigs fresh thyme, 2-3 sprigs fresh rosemary
Open oven and test internal temperature of patties with an instant read meat thermometer. Steak patties should read 150º for medium doneness. When steak patties are 150º, remove from oven and keep warm. For me - this was the point in the gravy recipe when they were ready.
Remove herbs from cast iron skillet. Add beef stock, bouillon, onion powder, garlic powder and Worcestershire sauce. Stir to combine and bring to a simmer.
1 1/4 cup beef stock, 1 cube beef bouillon, 1 tsp onion powder, ½ tsp garlic powder, 1 tbsp Worcestershire sauce
In a small bowl, whisk together cold water and cornstarch.
1/4 cup cold water, 1.5 tablespoons cornstarch
Add cornstarch mixture to skillet and stir. Allow gravy to thicken, then decrease to medium-low.
Let it gently simmer for 2-3 minutes, or until your desired thickness and concentration is obtained.
Spoon mushrooms, onions and gravy over the chopped steak and serve!