01 - Set the oven to 425°F and prepare a large rimmed baking sheet lined with parchment paper or foil.
02 - Slice the bell peppers and red onion into strips and arrange them evenly on the baking sheet.
03 - Drizzle olive oil over the vegetables, then sprinkle oregano, basil, garlic powder, smoked paprika, kosher salt, and black pepper. Toss gently to coat all pieces.
04 - Nestle the sausages among the seasoned vegetables on the baking sheet.
05 - Roast in the preheated oven for 25 to 30 minutes. Halfway through, flip sausages and stir vegetables. Continue until sausages reach an internal temperature of 160°F and vegetables are tender and caramelized.
06 - Remove from oven, garnish with chopped parsley if desired, and serve hot. Excellent as a standalone dish or accompanied by hoagie rolls, rice, or pasta.