Jamaican Sweet Potatoes with Jerk Spice

Ingredients

• 2 1/2 lb (1.1 kg) sweet potatoes, peeled if desired and cut into wedges or 1-inch chunks
• 3 tablespoons olive oil
• 1 tablespoon packed brown sugar
• 1 1/2 teaspoons kosher salt
• 1 teaspoon ground allspice
• 1 teaspoon dried thyme
• 1 teaspoon garlic powder
• 1/2 teaspoon ground ginger
• 1/2 teaspoon smoked paprika
• 1/4 teaspoon ground cinnamon
• 1/4 teaspoon cayenne pepper, plus more to taste
• 1/4 teaspoon black pepper
• 1 lime, zested and juiced
• 3 scallions, thinly sliced
• 2 tablespoons chopped fresh cilantro or parsley, optional