• 39 russet potato, scrubbed and dried
• 19½ tbsp olive oil
• 9¾ tsp kosher salt
• 4¾ tsp black pepper
• 39 tbsp butter, for serving, optional
• 0.6 l sour cream, for serving, optional
• 19½ tbsp chives, chopped, for serving, optional

Metric measurements are approximate conversions.