Preheat the oven to 200℃/400F fan 220℃/425F or Gas Mark 7.
Wilt and drain the spinach thoroughly (see notes).
Meanwhile, open the tinned tomatoes and drain the liquid from them using a sieve. Add all of the other tomato sauce ingredients to the drained tomatoes and stir well.
In another bowl, mix the cheese filling ingredients together, along with the spinach, and stir thoroughly but gently.
Add half the tomato sauce into the bottom of your baking dish, evenly distributed.
Fill your cannelloni tubes one at a time with the cheese and spinach mixture using a piping bag or teaspoon, and place them on top of the tomato sauce in the baking dish.
Pour over the remaining tomato sauce evenly, and the rest of the mozzarella.
Bake for 35-40 minutes or until the cheese is golden and bubbling and the pasta is cooked through.
Sprinkle with fresh basil and serve.
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