Ultimate Twice-Baked Potatoes

Ingredients

• 4 large russet potatoes (about 1.5-2 pounds / 680-900 grams)
• 1 tablespoon olive oil (15 ml)
• Salt (to taste)
• 1 cup shredded cheddar cheese (about 100 grams, plus extra for topping)
• ½ cup sour cream (120 ml)
• ¼ cup milk (60 ml)
• 4 tablespoons unsalted butter (56 grams)
• 1 teaspoon garlic powder (5 g)
• ½ teaspoon onion powder (2 g)
• ¼ teaspoon black pepper (1 g)
• 3 green onions, chopped (or chives)