Cut the cheddar block into 6 equally sized portions, approximately 3cm×3,5cm each. Take two pieces of bacon and wrap them around each piece of cheddar, fully enclosing the cheese. Trim any excess fat. Place the cheddar bacon bites in the freezer for 5 minutes to firm. Do not freeze.
Preheat the airfryer to 200 degrees. Mix the oil and breadcrumbs and stir until the mixture becomes loose and crumbly. Place each cheddar block into flour, then the eggs and then the breadcrumbs. Press coating to croquettes to ensure it adheres. Place the croquettes in the cooking basket and cook for 7-8 minutes or until golden brown.
Combine the ground beef, onion, breadcrumbs, parmesan cheese, egg, Italian seasoning, garlic powder and chopped parsley in a large bowl. Mix everything together with your hands until well combined.
Divide and shape the mixture into ten meatballs. Air-fry the meatballs for 10 minutes turning over half way through the cooking time.
Slice open the hoagie rolls and spread a little marina sauce inside. Place two slices of the provolone cheese over the sauce. Top the cheese with three meatballs per hoagie roll and a little additional sauce. Top with two more slices of provolone cheese and return the sandwiches to the airfryer, one or two at a time, to melt the cheese and toast the bread.