Butternut Squash Lasagna with Shitake Mushrooms and Sage
INGREDIENTS
* 3 tablespoons extra virgin olive oil
* 2 medium onions, chopped
* 1 pound fresh shiitake mushrooms, sliced
* 2 pounds butternut squash, peeled, seeded, cut into 1/4-inch-thick slices
* 2 cups vegetable broth
* 4 tablespoons chopped fresh thyme, divided
* 4 tablespoons sliced fresh sage, divided
* 3 15-ounce containers whole-milk ricotta cheese
* 4 cups grated mozzarella cheese, divided
* 2 cups grated Parmesan cheese, divided
* 4 large eggs
* Olive oil