Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Peel the sweet potato and cut into 1/2-inch cubes, then slice the chicken sausage into 1/2-inch rounds.
Place the sweet potato cubes, sliced sausage, chopped bell peppers, and sliced red onion onto the prepared sheet pan.
Drizzle the extra virgin olive oil over the ingredients and sprinkle evenly with sea salt, black pepper, garlic powder, and dried oregano.
Toss everything thoroughly with your hands or tongs to ensure an even coating of oil and spices across all pieces.
Spread the mixture into a single layer, ensuring the sweet potatoes have enough space to roast and crisp rather than steam.
Bake for 25 to 30 minutes, tossing halfway through the cooking time, until the sweet potatoes are fork-tender and the sausage is beautifully browned.
Remove the pan from the oven and garnish the roast with freshly chopped parsley before serving immediately.