A classic hearty meal that is always better homemade. Make sure to cook the mushrooms until the pan is nearly dry, as that's what makes them tasty and less rubbery.
In large bowl mix together all the steak ingredients (beef, bread crumbs, egg, Worcestershire sauce, onion powder, garlic salt, mustard powder, salt, and black pepper).
Shape into 4 oval patties. Set aside.
Make the gravy: Heat a large pan over medium-high and add olive oil. Add mushrooms and onions then cook until golden and excess mushroom liquid evaporates, about 5 minutes.
Add the garlic and butter, and cook for another minute, or until translucent.
Whisk the flour into the broth until smooth. Add the broth to the mushrooms and heat to a simmer. Season with salt and pepper, to taste (the saltiness and flavors will concentrate some when it reduces down).
Once gravy starts to boil, reduce heat to Low. Stirring often, simmer until the gravy starts to thicken, about 10 minutes. Set aside.
Air Fry Patties: Spray the air fryer basket/tray with oil. Place the patties in the basket/tray. Spray the patties with oil.
Air Fry patties at 380°F/193°C for 7 minutes. Flip the patties.
Continue to Air Fry at 380°F/193°C, for another 3-7 minutes or until the center temperature is 165°F/74°C or to your liking.
Serve the steak patties topped with the mushroom gravy.