Preheat the oven to 200C fan / 220C.
Cook the pasta according to instructions in lightly salted water. Drain (keeping a little of the pasta water) and put to one side.
In a large bowl mix together the ricotta, mozzarella/cheddar cheese and grana padano (or parmesan).
Mix in the cooked pasta followed by a few tsp of pasta water. Then add your chopped spinach and season. If the mixture feels too thick just continue to add a little more pasta water.
For the tomato sauce, mix together passata, oregano, garlic oil, salt and pepper in a small bowl.
Put your pasta/ricotta/spinach mixture in a large oven proof dish (mine is 13x8in) then pour the tomato sauce on top, spreading it out.
Cover in more grated mozzarella cheese and bake in the oven till golden - about 20-25 mins. Serve up with some fresh chives on top, enjoy!