Preheat oven to 425°F. Line a baking sheet with parchment paper or foil for easy cleanup.
In a large bowl, stir together ¼ cup melted butter, ⅓ cup brown sugar, 1 tsp cinnamon, and ½ tsp salt.
Pat 1½ lbs baby carrots dry with a paper towel. Add to the bowl and stir until evenly coated.
Spread carrots on the baking sheet in a single layer. Bake for 20-25 minutes, flipping halfway through. Check doneness with a fork—they should be tender with golden edges.
Notes
Use parchment paper or foil for easy cleanup and to prevent sticking. Adjust seasoning to taste.