2cupsbutternut squash puree (homemadeor frozen and thawed)
1 1/2cupschicken broth
1/2cupheavy cream
1teaspoonsalt
1/2teaspoonpepper
1/4teaspoonground nutmeg
1/4teaspoonred pepper flakesplus more for serving
5ouncesfresh baby spinach
3cupsshredded cooked chicken
2cupsshredded mozzarella cheese
1/2cupgrated Parmesan cheese
Directions
Heat oven to 375 F. Cook the pasta 2 minutes less than the package directions, since it finishes in the oven, and drain.
Melt the butter in a large pot over medium heat. Cook the onion about 5 minutes, until soft, then stir in the garlic for 1 minute. Whisk in the squash, broth, cream, salt, pepper, nutmeg, and red pepper flakes, and simmer 2 to 3 minutes. Stir in the spinach a handful at a time until it wilts.
Add the pasta, chicken, and 1 cup of the mozzarella to the pot and stir to coat. Spread in a greased 9-by-13-inch baking dish, and top with the remaining mozzarella and the Parmesan. Cover with foil and bake 20 minutes. Uncover and bake 10 to 15 minutes more, until bubbly and lightly browned. Pass extra red pepper flakes at the table.