Preheat the oven: Preheat your oven to 375°F (190°C).
Prepare the corn: Peel back the husks of the corn, but leave them attached at the base of the cob to use as handles. Remove any silk (the fine threads) from the corn kernels. If you prefer, you can also remove the husks completely and wrap the corn in aluminum foil.
Season the corn: Brush each ear of corn with olive oil to coat it evenly. Season with salt, pepper, and a sprinkle of ground cinnamon. You can adjust the amount of cinnamon to your taste, but start with about 1/2 teaspoon per ear.
Add thyme: Lay a few fresh thyme sprigs or sprinkle fresh thyme leaves over the corn. Thyme adds a wonderful herbaceous aroma and flavor.
Optional additions: If desired, you can add minced garlic for extra flavor by sprinkling it over the corn. For sweetness and richness, drizzle honey over the corn and add a pat of butter to each ear.
Wrap in foil (optional): If you removed the husks, wrap each ear of corn in aluminum foil to help keep it moist during roasting. If you left the husks on, fold them back over the corn to cover it.
Roast the corn: Place the prepared corn on a baking sheet or directly on the oven rack. Roast in the preheated oven for about 20-25 minutes. The exact cooking time may vary depending on your oven and the size of the corn, so check for doneness. The corn should be tender when pierced with a fork.
Serve: Carefully remove the roasted corn from the oven, and if you used aluminum foil, unwrap it. Serve the cinnamon thyme roasted corn on the cob hot as a delicious side dish.