Preheat oven to 375 degrees F.
In a large mixing bowl, combine the first 5 ingredients and whisk together. Once combined add your potatoes and green onion. Toss to combine.
Evenly spread the potatoes on a baking sheet and place them in preheated oven. Bake for 50 minutes, checking on and turning potatoes every 10 minutes.
Garnish with chopped chives and sour cream if desired.