Preheat your oven to 400°F (200°C).
On a large sheet pan, scatter the sweet potatoes, red onion, Brussels sprouts, and apple slices.
Drizzle the olive oil over the veggies and apples, then sprinkle on the thyme, rosemary, garlic powder, salt, and pepper. Toss everything to ensure even coating.
Add the sliced chicken apple sausage to the pan, arranging it evenly among the veggies.
Roast in the preheated oven for 25-30 minutes, or until the veggies are tender and the sausage is browned.
Halfway through roasting, give everything a good stir to ensure even cooking.
Serve hot, straight from the pan!
