Preheat your oven to 400°F (200°C).

Wash the baby potatoes thoroughly and cut them in half or quarters.

Slice the smoked sausage into 1/4-inch thick rounds.

In a small bowl, mix together the ranch seasoning, garlic powder, onion powder, and black pepper.

Place the halved potatoes in a large mixing bowl. Drizzle them with olive oil and sprinkle half of the ranch seasoning mixture over the top. Toss the potatoes well until they are evenly coated.

Line a baking sheet with parchment paper or lightly grease it.

Evenly spread the seasoned potatoes on the baking sheet in a single layer.

Scatter the sliced smoked sausage over the potatoes.

Place the baking sheet in the preheated oven and roast for about 35-40 minutes, stirring halfway through.

Remove the baking sheet from the oven and sprinkle the shredded cheddar cheese over the dish. Return to the oven for an additional 5 minutes, or until the cheese melts.

Garnish with freshly chopped parsley and serve hot, along with a dollop of sour cream if desired.