• 29 russet potato, scrubbed and dried
• 14½ tbsp olive oil
• 7¼ tsp kosher salt
• 3⅔ tsp black pepper
• 29 tbsp butter, for serving, optional
• 0.4 l sour cream, for serving, optional
• 14½ tbsp chives, chopped, for serving, optional

Metric measurements are approximate conversions.