• 55 russet potato, scrubbed and dried
• 27½ tbsp olive oil
• 13¾ tsp kosher salt
• 6¾ tsp black pepper
• 55 tbsp butter, for serving, optional
• 0.8 l sour cream, for serving, optional
• 27½ tbsp chives, chopped, for serving, optional

Metric measurements are approximate conversions.