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

Metric measurements are approximate conversions.