Lasagna with Sausage and Butternut Squash

Name: Lasagna with Sausage and Butternut Squash
Ingredients: 1 tablespoon extra-virgin olive oil, plus more as needed; 1 pound hot Italian sausage, casings removed; 1 large yellow onion, chopped; 3 garlic cloves, minced; One 1 1/2-pound butternut squash, cut into 1/2-inch dice (about 2 1/2 cups); 3/4 cup shredded parsnips; Kosher salt and cracked black pepper; Two 15-ounce containers part-skim ricotta; 2 large eggs; One 10-ounce package frozen chopped spinach, thawed and squeezed dry; 2 cups shredded mozzarella cheese; 1 cup shredded Parmesan cheese; 1 cup fresh basil leaves, torn; 6 cups store-bought or homemade tomato sauce; One 8-ounce package no-boil lasagna noodles