• 9 russet potato, scrubbed and dried
• 4½ tbsp olive oil
• 2¼ tsp kosher salt
• 1⅛ tsp black pepper
• 9 tbsp butter, for serving, optional
• 135 ml sour cream, for serving, optional
• 4½ tbsp chives, chopped, for serving, optional

Metric measurements are approximate conversions.