Preheat your oven to 400°F.
Prepare your veggies: Chop the cauliflower into bite-sized florets, slice the bell peppers into thin strips, slice the onion into wedges, and peel and chop the sweet potato into bite-sized pieces.
Transfer all of the chopped vegetables onto a large baking sheet and toss with the olive oil, salt, pepper, and garlic powder.
Roast the vegetables in your preheated oven for 20 minutes. While the vegetables are roasting, slice the chicken sausages into small rounds.
After 20 minutes, remove the veggies from the oven, give them a good stir, and add the sliced sausages to the pan. Place the tray back in the oven and continue roasting for an additional 20 minutes.
While the chicken sausages and veggies are roasting, make the creamy balsamic dressing. Combine all of the dressing ingredients in a large mixing bowl and whisk until smooth.
After 40 minutes, the sausage and veggies should be cooked through and slightly caramelized. Feel free to keep roasting them to your liking, though.
After they're finished cooking, scoop portions onto plates, drizzle with the creamy balsamic dressing, and serve! I like to serve them bowl-style over basmati rice.