Butternut Squash Mac and Cheese with Broccoli

Name: Butternut Squash Mac and Cheese with Broccoli
Cuisine: American
Ingredients: 1 medium butternut squash (1¾ lb.); 1 tablespoon extra-virgin olive oil (optional, learn more); 1 onion, finely chopped (1 cup); 4 cloves garlic, minced; ½ teaspoon finely chopped fresh thyme; 1 cup unsweetened, unflavored plant milk; 2 tablespoons nutritional yeast; 1 tablespoon white wine vinegar; ½ teaspoon sea salt; ⅛ teaspoon freshly ground black pepper; 3 cups dried whole grain penne pasta (8 oz.); 3 cups small broccoli florets; Fresh basil leaves