Preheat the oven to 425 degrees Fahrenheit.
Place the carrots on a large baking sheet. Drizzle with the oil of your choice, season with salt and pepper, and toss to coat. Use your hands to spread the carrots out evenly, then place in the oven to bake.
Check the carrots after about 20 minutes. Poke with a fork- if it slide through the carrot easily, it is done. If the carrots are not quite tender yet, continue cooking until they are. Don't worry- the carrots will not be browned at this point, just tender.
To get the nice char, turn off the oven and turn the broiler on HI. Slide the baking sheet under the broiler and let cook for 3 or 4 minutes, watching closely, until nicely charred.Remove from the broiler and place in a large bowl.
Add the butter, miso, and honey to a small microwaveable bowl. Microwave for 1 minute, or until the butter is completely melted (you may want to stop and stir half way through). Pour the glaze over the carrots and toss to coat. Serve right away.