Butternut Squash Lasagna without tomatoes

12 lasagna noodles 1 large butternut squash, about 3 lbs 2 tablespoons olive oil , divided 1/2 teaspoon salt 3 tablespoons butter , divided 2 cups chopped[...]

6 cups (1/2-inch) cubed peeled butternut squash 2 tablespoons extra-virgin olive oil, divided 2 tablespoons chopped fresh sage 12 garlic cloves, unpeeled[...]

2 teaspoons olive oil 3 cups chopped leeks 1 tablespoon chopped fresh sage (or 1 t. dry rubbed sage) 4 garlic cloves , minced 5 cups peeled butternut squash,[...]