Preheat your oven to 190 degrees celsius (fan-forced) and lightly grease a 20cm square baking dish.
Place the pumpkin pieces onto a baking tray and drizzle with the olive oil before sprinkling a little salt and pepper over the top. Pop into the oven and bake for 40 minutes or until the pumpkin is cooked through and beginning to brown on the outside.
Transfer the pumpkin to your Thermomix bowl. Mix for 10 seconds, speed 4 to mash. Scrape down the sides of the bowl and mix for a further 5 seconds, speed 5 if still lumpy. Set aside until needed.
In a clean Thermomix bowl, add the garlic and brown onion (which has been cut in half). Mix for 6 seconds speed 6 to grate.
Add 20 grams of olive oil and cook for 3 minutes, 100 degrees, speed 2 with the measuring cup off.
Add the passata and mix for 12 seconds, speed 5 with the mc on to combine. Set aside until needed.
Cover the base of your baking dish with lasagna sheets before adding half of the pumpkin mixture. Add a layer of spinach leaves (using half) before dolloping ⅓ of the sauce over the top.
Add another layer of Lasagna sheets and repeat the above.
Top with another layer of lasagna sheets and cover this with the remaining Pasta Sauce Sauce.
Dollop ricotta over the top and then sprinkle with mozzarella.
Bake for 35 minutes or until the cheese sauce is golden. Allow the Pumpkin and Spinach Lasagna to stand for 5 minutes before serving.