1.Pre-heated oven to 200C. Grease a 6cm deep, 16cm x 27cm base (2L) baking dish. Heat oil in a saucepan over medium heat. Add onion and carrot, and cook, stirring occasionally for 3-4 minutes or until softened. Add garlic and cook for a further 1 minute or until fragrant. Add the miso paste and tomato paste, stirring for 2 minutes. Add the mince and cook, breaking up any lumps with a wooden spoon, for 5-6 minutes or until it starts to caramelize and liquid has evaporated.
2.Add two of the noodle seasoning sachets (discard remaining sachets) and tomatoes, breaking up the tomatoes with the wooden spoon. Season with salt flakes and pepper.
3.For the cheats white sauce, combine all ingredients in a bowl. Season.
4.Add half of the mince mixture to the prepared baking dish, spreading to cover the base. Carefully break the blocks of noodles in half to make 8 pieces (each block of noodles are made of two sheets). Arrange half of the noodle pieces in a single layer over the mince.
5.Spread with half of the white sauce. Repeat layering with remaining mince, noodles and white sauce. Scatter over the parmesan and bake for 30 minutes or until noodles are tender.
6.Heat grill on high. Cook lasagne under grill for 3-5 minutes or until golden. Scatter with chilly flakes to serve.