Heat oven to 425 degrees. Prepare a sheet pan with parchment paper and set aside.
Place potatoes in a bowl. Add basil pesto, olive oil, salt and pepper tossing together to coat potatoes.
Layer potatoes on baking sheet. Roast in oven 20 minutes until potatoes are done and brown on edges. Remove pan from oven and allow potatoes to cool slightly.
Mix in a small bow, dressing ingredients - pesto, lemon juice, olive oil, salt and pepper.
Remove potatoes to a large bowl. Pour dressing over potatoes and gently toss to coat. Sprinkle on Parmesan cheese, chopped basil and chives.
Serve on a platter with an additional drizzle of olive oil and a sprinkle of salt and pepper. Best enjoyed warm or at room temperature.