Preheat your oven to 200ºC/Gas mark 6.
Place the mince in a non-stick wok or saucepan and dry fry for about 5 minutes until browned (this means you don't have to add any extra oil or fat to the pan and a little fat will come out of the mince which will help the meat to brown).
Add the onion and garlic and cook for 2 - 3 minutes.
Add the courgettes, sweetcorn, chopped tomatoes, tomato puree and ketchup, herbs and black pepper.
Cook gently over a low heat for a few minutes. Add the cubed cheese into the mixture and carefully transfer into an ovenproof dish.
Top with the oven chips and sprinkle with the grated cheese.
Cook for approximately 20 - 25 minutes until the chips are cooked and browned.