In a bowl, combine the ground beef with onion powder, garlic powder, burger seasoning, pepper, salt blend, Worcestershire sauce, and breadcrumbs. Mix until everything is well blended.
Shape the mixture into four equal patties.
Heat a small amount of oil in a pan and sear the burger patties until they are browned on the outside but not fully cooked. Remove the patties from the pan and set them aside.
Add butter to the same pan, then sprinkle in flour and stir to form a roux.
Slowly pour in the beef stock, making sure to scrape up any browned bits from the bottom of the pan.
Season the gravy with a pinch of salt and allow it to thicken.
Return the burger patties to the gravy, reduce the heat to medium, cover the pan, and cook for about 10 to 12 minutes.
Serve each patty over a bed of mashed potatoes and top with crispy French fried onions.
