In a large non stick pan, heat 1 tablespoon of the olive oil on medium heat, when hot, add the onion and saute until softened, about 5 minutes or so. Remove 1/2 the onion to a large mixing bowl and the other 1/2 to another bowl and set those aside for the gravy. Set the pan aside.

To the large mixing bowl, add the beef, bread crumbs, grill seasoning, Worcestershire sauce, and egg. Mix everything together well and shape into 5 patties.

Same pan used for the onion, heat the other tablespoon of oil, when hot, add the patties and brown them, cook about 4-5 minutes on each side. You are not trying to cook the patties through, just browning them. Remove the patties to a plate.

Pour off all but 2 tablespoons of the fat from the pan and return to heat, add the mushrooms, saute the mushrooms for about 5 minutes until they start to wilt and soften up, then return the onion to the pan, then sprinkle in the flour, stir and cook for 2 minutes. Add the broth and bring to a boil.

Return the patties to the pan and reduce the heat to a simmer. Simmer until the gravy has thickened and the patties are cooked through, about 8-10 minutes.

Serve with mashed potatoes or egg noodles, spooning the gravy over the potatoes or egg noodles. Enjoy.