Preheat the oven to 200C on bake function.
Chop pumpkin into cubes (not small cubes)
Place in a roasting tray, drizzle in 2tbsp oil and season with salt and pepper. Bake for 20 to 25 minutes until soft and golden, turning if needed. Remove from oven.
While your pumpkin cooks, place a large pot of water on to boil. Pre-cook the pasta – you want it almost cooked but not quite so try undercooking it by 3 minutes.
In a large pan, heat 1tbsp olive oil over medium-low heat. Add the spinach and nutritional yeast and cook until wilted. Next, add the tomatoes, chopped up sage and salt and pepper to taste. Simmer till soft (5min)
In a large baking casserole dish, mix together the pumpkin, pasta, tomato mixture, pieces of ricotta cheese and sage.
Bake in the oven for 10 minutes until the cheese is melted, then place under the grill until golden.
Divide into two serves.