Prepare all the ingredients.
Thaw and drain the spinach. Mix with the cheddar and ricotta.
Mix well.
the chopped onion and crushed garlic in a pan.
Add the ham...
...the mushrooms and cook for a few minutes.
Add the peeled, seeded and tomatoes...
...and the tomato paste. Simmer for 5 minutes. Add the chopped basil.
Put a layer of lasagna at the bottom of a baking dish.
Cover with half of the spinach mix.
Cover again with lasagna pasta...
...then with the ham mix. Repeat with the remaining ingredients. Coat with liquid creamand sprinkle with parmeesan.
Cover and bake in a medium (180°C or 356°F) oven for 30 minutes. 10 minutes before the end, remove the aluminium foil that covers it.