Preheat the oven at 180 degrees C

Halve the peppers and remove the seeds and pith

Lay on a baking tray and brush with olive oil

Set aside

Slice the cherry tomatoes

Slice the black olives

In a bowl mix the onions, tomatoes, olives and basil

Season with black pepper

Divide the mixture evenly among the peppers

Place in the oven for 20 minutes

Slice the mozzarella

Place slices of mozzarella on top of each of the pepper halves

Return to the oven and bake for a further 20 minutes until the peppers are soft and the cheese is melted and browning