In a medium bowl, combine the ground beef, egg, almond flour, sea salt, black pepper, garlic powder, and onion powder.
Shape the mixture into two equal oval-shaped patties.
Heat the olive oil in a large skillet over medium-high heat.
Sear the patties for 3 to 4 minutes per side until deeply browned, then remove them from the pan and set aside.
Add the sliced mushrooms and diced onion to the same skillet and sauté for 5 minutes until soft and caramelized.
In a small bowl, whisk together the beef bone broth, coconut aminos, and arrowroot powder until smooth.
Pour the broth mixture into the skillet and bring to a gentle simmer.
Place the patties back into the skillet and cook for another 4 to 5 minutes until the gravy has thickened and the meat is cooked through.