Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper or foil for easier cleanup.

In a large bowl, combine the sliced smoked sausage, chopped potatoes, and onion pieces.

Drizzle the olive oil over the mixture, then sprinkle with smoked paprika, garlic powder, salt, and black pepper. Toss until everything is evenly coated.

Spread the sausage and potato mixture in a single layer on the prepared baking sheet.

Roast in the oven for 35–45 minutes, stirring once or twice, until the potatoes are golden brown and tender and the sausage has browned.

Remove from the oven and garnish with fresh parsley if using. Serve hot.