Preheat the oven to 400° F.
In a medium skillet or saucepan, combine butter, honey, rosemary, salt, and pepper. Heat over medium heat, stirring constantly, until melted and bubbly.
Add the carrots directly to the pan with the sauce and toss well.
Pour the carrots and sauce onto a rimmed baking sheet that has been coated with cooking spray (you an also line it with parchment paper or foil for easy clean up). Roast in the oven for 20 minutes, tossing halfway through.
Transfer to a serving dish and sprinkle with additional salt and pepper to taste. Serve immediately.