Preheat the oven to 450F and line a sheet pan with parchment paper.
Add the sliced carrots, onion, and garlic to a large bowl. Drizzle with olive oil and toss to coat.
Spread the vegetables onto the parchment lined sheet pan and disperse evenly.
In a small bowl combine the brown sugar, cinnamon, garlic powder, salt, and pepper. Mix well.
Sprinkle the seasoning mixture over the surface of the vegetables and toss to coat.
Bake for 1 hour, checking at the halfway point and tossing the vegetables briefly to ensure even cooking.
Serve and enjoy!