Preheat the air fryer.
To clean caps, pat with a damp cloth and remove stems. Brush with olive oil and season with salt and pepper.
In a medium bowl, combine ricotta cheese, bacon crumbles, spinach, bell pepper, onion, garlic, dill, and bread crumbs.
Spoon equal amounts of filling into each mushroom cap.
Place in prepared air fryer basket and top with mozzarella.
Cook at 370F, air fryer setting, for 6 to 8 minutes. The mushrooms will be tender, and the filling top will brown.
Serve immediately. Optional, drizzle with balsamic vinegar glaze and chopped fresh parsley.
Plate, serve, and enjoy!