Preheat a grill to high. Bring a large pan of water to the boil and cook the gnocchi following pack instructions, then drain.
Meanwhile, heat the basil oil in a frying pan and cook the garlic briefly before stirring in the passata, cherry tomatoes and basil leaves. Cook for 3-4 minutes to heat through and then add the cooked gnocchi.
Spoon the gnocchi mixture into a large ovenproof dish and scatter over the mozzarella cheese. Grill for 5 minutes or until the mozzarella is golden and bubbling.
Freezing and defrosting guidelines
Omit the final instruction of grilling for 5 minutes. Once the dish has cooled completely, transfer it to an airtight, freezer-safe container, seal and freeze for up to 1-3 months. To serve, defrost thoroughly in the fridge overnight before reheating. Loosely cover with foil and bake until dish is thoroughly heated through. Reheat until piping hot. Then complete the cooking by grilling for 5 minutes.