Ingredients

1/2 pound (227g) cremini mushrooms, halved (or quartered, if large)
1 large yellow onion, cut lengthwise into 1/4 inch slices
2 tablespoons olive oil
2 teaspoons Worcestershire sauce
1/2 teaspoon fine sea salt salt
1/4 teaspoon ground black pepper
1/4 teaspoon garlic powder

Directions

Place all of the ingredients in a large bowl and toss together until the mushrooms and onions are well coated.

Transfer to the air fryer basket and air fry on 400F for 11-13 minutes, or until the mushrooms are browned and tender and the onions start to caramelize around the edges. (Stir the mushrooms and onions at the halfway point to ensure they cook evenly).