In a large bowl, combine ground beef, ground pork, panko breadcrumbs, egg, garlic, salt, and pepper. Mix gently until just combined—don't overmix or the meatballs will be tough.
Roll the mixture into 24 meatballs, about 1.5 inches each. Make them as uniform as possible so they cook evenly.
Preheat your air fryer to 375°F for 3 minutes.
Spray the air fryer basket with cooking spray and arrange meatballs in a single layer, leaving space between them. Work in batches if needed.
Air fry for 10-12 minutes, shaking the basket halfway through, until meatballs are cooked through and browned (internal temperature should reach 160°F).
While meatballs cook, whisk together honey, sriracha, soy sauce, and rice vinegar in a large bowl to make the sauce.
Transfer cooked meatballs to the bowl with the sauce and toss gently to coat evenly.
Arrange on a serving platter, garnish with sliced green onions and sesame seeds. Serve with toothpicks for easy grabbing!