Preheat oven to 400°F. In a small saucepan, melt the butter with the maple syrup and sugar until the sugar is dissolved. Set aside.
Line the carrots on a baking sheet in a single layer. Pour the maple syrup mixture over the carrots and add the salt and pepper. Toss to combine.
Bake the carrots for 30-40 minutes or until the carrots are tender. Make sure you toss them every 10-15 minutes. Sprinkle with additional salt if needed.
Notes
If you want to shorten the cooking time, slice the carrots in half.
For easier cleanup, just place the carrots on some parchment paper.
You know the carrots are done when you can pierce the largest part of the carrot with a fork.
Speaking of doneness, you want to try to have similar sized carrots so they all cook in about the same amount of time.