Peel the squash and thinly slice the squash into circular pieces, like chips. Toss the squash and asparagus with olive oil,salt, and pepper. Place the veggies around the salmon, placing them in an even layer. Make sure to cut the butternut squash thin or it won't cook through in the allotted time. If you prefer thicker squash, put it in 10-15 minutes before adding the salmon and green beans.