Preheat oven to 190 degrees celsius (fan-forced).
In a 22cm square baking dish, spread approximately ⅓ of the crushed tomatoes over the base.
Place the parmesan cheese (cut into 3cm pieces) into Thermomix bowl and mix for 8 seconds, speed 8 to grate.
Scrape down the sides of the bowl and add the ricotta cheese, nutmeg, egg and salt and pepper and mix for 10 seconds, speed 4.
Scrape down the sides of the bowl and add the spinach leaves. Mix for 10 seconds, speed 4, reverse to combine. You will need to use the spatula to push down the spinach leaves towards the blades.
Using a teaspoon, carefully push ricotta mixture into the cannelloni. When filled, place in baking tray.
Spread the remaining crushed tomatoes over the top of the filled pasta, before sprinkling with the grated tasty cheese.
Place into the oven and bake for 35 minutes or until the cheese is golden and pasta cooked through when tested with a skewer.