Preheat broiler to high. Transfer the carrots to a large rimmed baking sheet. Drizzle with oil and toss to coat. Space the carrot pieces evenly on the pan, then flatten with the bottom of a mason jar or sturdy glass. Combine curry powder, salt and pepper in a small bowl. Sprinkle over the carrots. Broil until hot and starting to brown, about 4 minutes. Sprinkle with cilantro before serving, if desired.