Creamy Garlic Mashed Potatoes

Bahan-bahan (6 porsi)

• 1 head garlic
• 1 tablespoon olive oil
• 3 pounds potatoes (russet or Yukon gold)
• 1 cup heavy whipping cream (more as needed)
• ⅓ cup salted butter
• salt and black pepper ( to taste)
• chopped fresh parsley (or chives, for garnish, optional)