Air Fryer Burgers with Mushrooms

Ingredients

• • 1 cup (150 g) white mushrooms, sliced
  • 1 small onion, cut into rounds ½ inch (1 cm) thick
  • 1 tsp (5 ml) olive oil
  • 1 tsp (5 ml) Worcestershire sauce
  • 3/4 lb (340 g) lean ground beef
  • 2 hamburger buns, warmed (see note)
  • Whole-grain mustard, to taste
  • Mayonnaise, to taste
  • 2 slices Swiss cheese
  • 1/2 cup (15 g) arugula