Brown Sugar Roasted Sweet Potatoes

Bahan-bahan (4 porsi)

• 2 pounds sweet potatoes (peeled)
• 2 tablespoons brown sugar
• 1 tablespoon olive oil
• 1 tablespoon butter (softened)
• ½ teaspoon cinnamon
• ¼ teaspoon ground ginger
• ¼ teaspoon salt