Using a large rectangular ovenproof dish and depending on how large the dish is you may require 3 to 4 sheets of lasagna per layer
Cook the lasagna sheets as per package instructions and place them individually on a flat sheet of baking paper. Grate the cheese and set aside. Preheat oven to 180 degrees Celsius
Pour half a cup of the white sauce at the bottom of the dish
Place 3-4 lasagna sheets on top of the sauce
Add one third of the veggies on top
Add another layer of lasagna sheets. Pour half a cup of white sauce on top. Add another third of the veggies
Place more lasagna sheets on top. Pour over half cup of white sauce
Add the last bit of veggies on top. Add a final layer of lasagna sheets. Pour the remaining sauce over. Sprinkle with cheese and some paprika
Cover with a foil and bake at 180 degrees Celsius for 25-30 minutes or until lasagna is cooked. In the last 5 minutes of cooking time turn the grill function on and allow the cheese to turn a golden brown