Cut the carrots diagonally into 1 1/2-inch segments. For thicker carrots, halve the slices for uniform cooking.
In a bowl, combine the carrots with brown sugar, melted butter, olive oil, minced garlic, salt, and cinnamon until they are evenly coated.
Spread the carrots on a parchment-lined baking sheet. Roast for 15 minutes, stir, then roast for another 10-15 minutes until tender and caramelized.