Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with unbleached parchment paper to prevent sticking without using excess oil.
Wash and peel the sweet potato, then dice it into uniform 1/2-inch cubes to ensure even roasting.
Core the red bell pepper and chop it into 1-inch pieces, and slice the chicken sausage links into 1/2-inch thick rounds.
Place the sweet potato cubes, bell peppers, and sliced sausage onto the prepared baking sheet.
Drizzle with the olive oil and sprinkle the sea salt, black pepper, garlic powder, and dried oregano over the top.
Use your hands or a spatula to toss everything together until the ingredients are thoroughly and evenly coated in the oil and spices.
Spread the mixture out into a single layer, ensuring the pan is not overcrowded so the vegetables roast rather than steam.
Bake for 25 to 30 minutes, tossing halfway through, until the sweet potatoes are tender and the sausage is beautifully browned and crisp on the edges.
Remove from the oven and let rest for 2 minutes before serving warm.