This Ina Garten Roasted Butternut Squash Lasagna is made with butternut squash, extra-virgin olive oil, Kosher salt, onion, whole milk, and assorted cheeses. It takes around 2 hours to prepare and cook. You can serve your Butternut Squash Lasagna with an arugula, orange, and onion salad, Brussels sprouts slaw, garlic bread, and roasted asparagus.