Place a baking rack over the foil and spray with cooking spray.
Season the outside of each of the hamburger steaks with the salt, pepper, onion powder and garlic powder to your preference.
Place the hamburger patties on top of the baking rack. Bake for 15-25 minutes until the the juices from the patties are clear.
In the meantime, melt the bacon grease or oil in a large skillet over medium heat.
Add the mushrooms and onions. Sauté until the vegetables are tender about 10 minutes.
Add the flour and stir until the flour is incorporated and there are no lumps.
Add the beef broth. Continue to simmer for 3-5 minutes until the broth begins to thicken into a gravy.
Season the gravy with additional salt and pepper if needed.
To serve, spoon the gravy over the tops of the hamburger steaks.
Video
Notes
Storage, Freezing and Reheating
Storage. I recommend storing the hamburger steaks separate from the gravy, only because the gravy will need a little more attention when it’s reheated. You can wrap the steaks individually in plastic wrap or place them in an airtight container. Likewise, the gravy should also be stored in an airtight container with a lid. Store in the refrigerator withing two hours and consume within five days.Freezing. The cooked hamburger patties can be frozen for later use. However, I do not recommend trying to freeze the gravy. Freezing will cause the gravy to separate and change the texture of the mushrooms.Reheating. The hamburger patties can be reheated for 1-2 minutes in the microwave. You can also reheat them in the oven at 250 degrees for 20-30 minutes until they are heated through. Place the gravy in a saucepan and heat over medium low heat. Stir in ¼ - ½ cup of additional beef broth until the gravy is smooth and reaches your desired consistency.