Step 1

Preheat the oven to 200°C/180°C fan/400°F/Gas

Step 2

Heat 2 tablespoons of the olive oil in a large, non-stick frying pan over a medium heat. When hot, add the onion and cook for 3 minutes, then add the courgettes and ½ teaspoon of salt and reduce the heat to low. Cook the courgettes for 15 minutes, until they have a little colour and the onions are soft. Add the tomatoes and thyme and cook over a low heat for a further 15 minutes, until everything has a similar texture. Check the seasoning, remove from the heat and set aside. Use the remaining olive oil to grease the inside of a small baking dish. Tip the courgette and tomato mixture into the dish, then top it with the mozzarella. Mix the breadcrumbs and Parmesan together and sprinkle the mixture evenly over the top of the dish. Bake the dish for 20 minutes, until the top is golden and bubbling, then remove it from the oven and leave it to rest for 5 minutes before serving.