Combine the butternut squash, sweet potatoes, onions, garlic, olive oil, rosemary, sage, and salt and pepper in a large bowl. Toss and spread in a single layer on a baking sheet.
Nestle the sausage in the pan.
Roast for 20 minutes and then turn the sausages. Continue roasting for 20 more minutes, or until the sausage is golden brown and cooked through and the vegetables are tender.
Video
Notes
You can change this up by using your favorite vegetables. I like to substitute 1 pound of Brussels sprouts for the sweet potatoes.