Creamy Vegan Butternut Squash Carbonara

Name: Creamy Vegan Butternut Squash Carbonara
Ingredients: 1 pound butternut squash, peeled, seeded and cut into 1-inch cubes (3 cups); 1 medium onion, chopped; 4 cloves garlic, divided; 2 tablespoons tomato paste; 2 tablespoons extra-virgin olive oil, divided; 1 teaspoon salt, divided; ¼ teaspoon ground pepper; 1 pound whole-wheat spaghetti; ½ cup almonds, coarsely ground; 1 tablespoon chopped fresh sage; 1 cup no-chicken broth or vegetable broth, warmed; 3 tablespoons nutritional yeast