01 - Preheat your oven to 425°F (220°C). Line a large rimmed baking sheet with parchment paper or lightly grease it.
02 - In a large bowl, combine the Brussels sprouts, sweet potatoes, and red onion. Drizzle with olive oil, season with half the salt and pepper, and toss to ensure even coating.
03 - Spread the seasoned vegetables evenly onto the prepared baking sheet. Arrange the sliced chicken sausages among the vegetables.
04 - In a small saucepan over medium heat, combine the cranberries, orange juice, orange zest, maple syrup (or honey), Dijon mustard, dried thyme, and the remaining salt and pepper. Simmer for 5 to 7 minutes, stirring occasionally, until the cranberries begin to burst and the sauce slightly thickens.
05 - Drizzle half of the prepared cranberry-orange glaze over the sausage and vegetable mixture on the baking sheet. Toss gently to coat everything.
06 - Roast in the preheated oven for 25 to 30 minutes. Stir the contents once halfway through the roasting time, until the vegetables are tender and caramelized, and the sausages are nicely browned.
07 - Remove the baking sheet from the oven. Drizzle with the remaining cranberry-orange glaze. If desired, garnish with fresh chopped parsley and extra orange zest.
08 - Serve the sheet-pan dinner hot.