Prep vegetables · toss with oil
Cut onion, peppers, and mushrooms into slices. Place them in a medium bowl and toss with 1 Tbs cooking oil.
Philly Steakburger (Air Fryer)
Preheat the air fryer
Start preheating the air fryer at 390°F.
Season buns · form patties
Spread ½ Tbs mayo on the inside of each of four hamburger buns (helps browning). Season with rosemary and garlic salt.
Form the meat into 4 patties (¼ lb each so they fit most air fryer baskets). Salt and pepper the patties.
Air fry the vegetables
Place vegetables in the air fryer basket and cook for 6 minutes. Shake the basket after about 3 minutes for even cooking.
Toss with Worcestershire
Take the vegetables out and return them to the bowl. Pour in Worcestershire sauce and toss.
Toast the buns (in batches)
Place both sides of two hamburger buns face up in the air fryer and cook for 2 minutes. This gives a crunchier bun that holds up to the juicy filling. Move buns to a plate or platter, then repeat for the other two buns.
Cook the burgers
Add the burgers to the air fryer and cook for 10 minutes. Flip after the first 5 minutes and salt and pepper the second side.
Top with vegetables and cheese · melt
When the burgers are done, top each with the vegetables and 1 slice provolone. Close the air fryer for the cheese to melt—the fryer should still be warm enough without turning it back on.
Place on buns
Carefully lift each burger out of the air fryer with a spatula and place on the buns.
