Preheat oven to 200 degrees celsius (fan-forced). Grease a large 30cm x 40cm rectangular baking tray and set aside.
Place the defrosted spinach, ricotta, egg yolks, minced garlic, grated cheese and salt and pepper into the Thermomix bowl. Mix for 10 seconds, Speed 3. Scrape down the sides of the bowl and repeat for a further 5-10 seconds or until completely combined.
Cut the fresh lasagne sheets in half.
Spoon a small amount of the spinach and ricotta mixture along the middle of the lasagne sheet and roll up. Place the rolled cannelloni seam-side down in the prepared baking tray.
Repeat with the remaining lasagne sheets and mixture.
Pour over the passata, sprinkle with the grated mozarella cheese and bake in the oven for 30 minutes.