
Place a rack in the center of your oven and preheat to 425°F. For easy clean up, line a rimmed baking dish with foil, then coat the foil with nonstick spray.
Scrub the carrots thoroughly (no need to peel). cut into very long, diagonal slices—they should be about 4 inches long each; you'll likely have 2 to 3 pieces per carrot.
Place the carrots on the sheet pan, then top with the honey, oil, cinnamon, salt, and pepper. Toss to coat, then spread into an even layer.
Bake the carrots until they are caramelized and browned and fork tender, about 25 to 35 minutes, flipping them halfway.
Remove from the oven and toss with the orange zest and flaky salt. Carefully taste and add more salt as desired. Sprinkle with parsley and serve hot or at room temperature.