Prepare the oven and vegetables: Preheat oven to 200°C (400°F). Wash and chop the potatoes, carrots, zucchini, capsicum and red onion into similar-sized pieces so they cook evenly. Add the vegetables to a large baking tray.
Season the vegetables: Drizzle the vegetables with olive oil and add garlic, smoked paprika, dried oregano, onion powder (if using), salt and pepper. Toss well until everything is evenly coated.
Add the sausages: Place the sausages evenly throughout the tray, leaving a little space between ingredients to help everything roast rather than steam.
Bake until golden" Bake for 40–45 minutes, turning the vegetables halfway through cooking. The sausages should be browned and cooked through, and the vegetables should be tender with delicious golden edges.
Rest and serve: Remove from the oven and allow the tray bake to rest for a few minutes before serving. Enjoy on its own or with crusty bread, salad, rice, or your favourite side dishes.