Roll out dough and cut out your pizza base shapes. I used a large scone cutter.
Spread with a little oil and grill, oil side up under the grill.
Cook for a couple of minutes until browned and dough becomes still and puffs up slightly.
Remove and place grill side up on working surface.
Spread a layer of nutella on top leaving a border around the edge.
Place under grill and cook again for around 3 minutes, until cooked through.
Transfer to a cutting board and arrange banana slices on tops of pizza.