01 -
Set the oven temperature to 190°C (375°F) to prepare for baking.
02 -
Boil pasta in salted water according to package instructions until al dente, then drain and set aside.
03 -
Heat olive oil over medium heat in a large skillet; add chopped onion and cook until translucent, about 5 minutes.
04 -
Incorporate minced garlic into the skillet and sauté for 1 to 2 minutes until fragrant.
05 -
Lower heat and stir in pumpkin puree, heavy cream, vegetable broth, nutmeg, salt, and black pepper. Combine thoroughly.
06 -
Cook the sauce for 8 to 10 minutes, stirring occasionally, until it thickens slightly.
07 -
Remove skillet from heat and fold in half the mozzarella and Parmesan cheeses until melted and fully integrated.
08 -
Mix cooked pasta with the pumpkin cheese sauce ensuring even coating.
09 -
Transfer the pasta mixture into a greased 23x33 cm baking dish.
10 -
In a small bowl, combine panko breadcrumbs, melted butter, and remaining mozzarella and Parmesan cheeses. Sprinkle this evenly atop the pasta.
11 -
Bake for 20 to 25 minutes until the topping is golden brown and cheese bubbles.
12 -
Allow to cool briefly, then garnish with fresh parsley and optional chopped sage before serving warm.