• 19 russet potato, scrubbed and dried
• 9½ tbsp olive oil
• 4¾ tsp kosher salt
• 2⅓ tsp black pepper
• 19 tbsp butter, for serving, optional
• 0.3 l sour cream, for serving, optional
• 9½ tbsp chives, chopped, for serving, optional

Metric measurements are approximate conversions.