Preheat the grill to high. Heat the oil in a large frying pan and then soften the onion and pepper for 5 minutes. Stir in the garlic and fry for 1 minute.
2.
Tip in the tomatoes and gnocchi and bring to a simmer. Bubble for 10-15 minutes, stirring occasionally, until the sauce has thickened. Stir in the basil and then transfer into an ovenproof dish.
3.
Scatter with the mozzarella and grill for 5-6 minutes until the cheese is bubbling and golden.
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