Squash and Spinach Lasagna

Name: Squash and Spinach Lasagna
Ingredients: 9 no-boil lasagna noodles; 1 tablespoon extra-virgin olive oil; 3 cloves garlic, finely chopped; 1 large onion, finely chopped; Kosher salt and freshly ground black pepper; 4 cups lowfat (1-percent) milk; 1/4 cup cornstarch; Two 5-ounce packages baby spinach; 1/2 cup fresh flat-leaf parsley leaves, finely chopped, plus more, for garnish; 1/4 teaspoon freshly grated nutmeg; 1 butternut squash (about 2 1/2 pounds), peeled, seeded, halved lengthwise and cut into 1/4-inch-thick half-moons; 2 cups shredded part-skim mozzarella