Preheat the oven to 400 degrees.
Remove the skin from the sweet potatoes and cut them into ½ inch cubes.
Then slice the chicken sausage into 1-inch rounds.
Slice off and discard the bottom of the Brussels sprouts and then cut in half.
Place the sausage rounds, sweet potato cubes, and Brussel sprouts into a large bowl.
Drizzle with the olive oil, toss until the sausage and veggies are coated, then spread evenly onto a sheet pan. You can use parchment paper or foil to minimize cleanup.
Sprinkle with salt and black pepper, then cook for 30-35 minutes or until the sausages are brown and the potatoes and brussels sprouts are tender. Flip the sausage and veggies halfway through the cooking time. Serve hot.