Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Slice the chicken sausage links into half-inch thick rounds and cut the bell peppers and red onion into thin, uniform strips.
Place the sliced sausage, peppers, and onions onto the prepared baking sheet.
Drizzle the extra virgin olive oil over the ingredients and sprinkle with dried oregano, garlic powder, sea salt, and black pepper.
Toss everything together with your hands or tongs until the sausage and vegetables are evenly coated in the oil and spices.
Spread the mixture out into a single layer, ensuring there is space between pieces so they roast and caramelize rather than steam.
Roast in the oven for 20 to 25 minutes, tossing the ingredients halfway through, until the sausage is golden brown and the peppers are tender and blistered.
Remove from the oven and garnish with freshly chopped parsley before serving hot.