Creating Air Fryer Pizza Meatball Subs is easy when you follow these simple steps:

1. Preheat the Air Fryer: Preheat your air fryer to 375°F (190°C).
2. Prepare the Meatball Mixture: In a large bowl, combine ground beef, breadcrumbs, grated Parmesan cheese, chopped parsley, egg, garlic powder, onion powder, Italian seasoning, salt, and pepper. Mix until well combined.
3. Form Meatballs: Shape the mixture into meatballs, about 1 to 1.5 inches in diameter. Aim for uniform sizes for even cooking.
4. Air Fry the Meatballs: Lightly coat the air fryer basket with cooking spray. Place the meatballs in a single layer in the basket. Cook for 10-12 minutes, turning halfway through, until they are browned and cooked through.
5. Prepare the Subs: While the meatballs are cooking, slice the sub rolls open. Lay them on a baking sheet and set aside.
6. Add Marinara Sauce: Once the meatballs are done, remove them from the air fryer and toss them in marinara sauce.
7. Assemble the Subs: Place the sauced meatballs into the sub rolls. Top each sub with shredded mozzarella cheese.
8. Air Fry Again: Return the assembled subs to the air fryer. Cook for an additional 5 minutes at 375°F (190°C) until the cheese is melted and bubbly.
9. Serve Immediately: Carefully remove the subs from the air fryer and let them cool slightly before serving.

These steps will guide you through creating the most delicious Air Fryer Pizza Meatball Subs in no time!