Easy Hasselback Potatoes

Bahan-bahan (6 porsi)

• 6 medium yellow potatoes (cleaned and dry)
• 5 tablespoons salted butter (melted)
• 4 tablespoons olive oil
• ¼ cup shredded Parmesan cheese (plus more for topping if desired)
• 1 tablespoon garlic paste (see notes)
• 1 tablespoon chopped fresh chives (divided)
• ¼ teaspoon salt
• ¼ teaspoon black pepper