Place the halved aubergines on a baking sheet skin side down. Rub them with the olive oil and season with salt. Place in an oven at 200oc for around 15-20 minutes until soft.
In a bowl mix the panko breadcrumbs, parmesan cheese and some olive oil.
Remove from the oven. Cover each of the aubergine halves with the tomato sauce, sprinkle the mozzarella cheese over each half.
Top each half with the breadcrumb mixture then place back in the oven until perfectly golden and bubbling.