In a bowl, combine sour cream and chopped chives. Season with salt as needed. Cover bowl and place in the fridge until ready to use.
Place sweet potato cubes in a baking tray. Drizzle with 2 tablespoon olive oil and toss until cubes are coated in oil.
Spread into an even layer. Bake in a preheated oven with top heat or broiler function at 200°C/400°F for 12 minutes or until tender.
Meanwhile, in a small bowl stir together olive oil, parsley, salt, ground pepper, and ½ cup parmesan cheese. (see Note 1)
Remove the sweet potato cubes from the oven and pour the parsley mixture over it and toss until completely and evenly coated. Return to oven and bake for another 3-5 minutes.
Transfer the baked sweet potato cubes into a serving dish. Sprinkle with more parmesan cheese.
Serve with the sour cream-chive as a dip or pour the mixture directly and toss to coat evenly.
Notes
Note 1 - As the saltiness of parmesan cheese may vary, reduce or add salt accordingly.