Preheat the oven to 425°. In a medium bowl, toss the carrots with the olive oil and cinnamon and season with salt and pepper. Scrape the carrots onto a large rimmed baking sheet and roast in the oven for about 15 minutes, until almost tender. Drizzle the honey over the carrots and toss to coat. Roast for about 10 minutes longer, until the carrots are tender and lightly browned in spots.