Air Fryer Marinara Meatball Sub

Ingredients

• 300g lean beef mince
• 300g lean pork mince
• 80g dried breadcrumbs
• 1 egg, beaten
• 1 tsp dried sage
• 1 tsp dried thyme
• salt
• pepper
• 400g good-quality passata
• 1 tbsp garlic purée
• 1 tbsp dried oregano
• 1 tsp onion granules
• 1 tsp dried chilli flakes
• 4 sub rolls or 2 baguettes, halved
• 1 red onion, sliced
• 1 red pepper, sliced
• 8 thin cheese slices