Preheat the oven: Set to 425°F (220°C). A hot oven is key for caramelization.
Prep the carrots: Peel and cut into evenly sized pieces—about 1/2-inch thick sticks or coins.
Even size means even cooking.
Make the glaze: In a large bowl, mix melted butter, olive oil, brown sugar, salt, pepper, and any optional spices. Stir until the sugar dissolves a bit.
Toss to coat: Add the carrots to the bowl and toss until every piece is glossy. Don’t skimp—coating matters for that shiny finish.
Spread on a sheet pan: Use a large, rimmed baking sheet and line it with parchment for easy cleanup. Spread in a single layer with a little space between pieces.
Roast: Bake for 15 minutes.
Stir or flip the carrots to expose new sides to the pan, then roast 10–15 minutes more, until tender with caramelized edges.
Check doneness: Pierce with a fork. They should be tender but not mushy. If needed, roast 5 minutes more.
Finish: Taste and adjust salt.
Add a squeeze of lemon or a sprinkle of zest for brightness. Top with fresh herbs.
Serve warm: Transfer to a warm dish and spoon any pan juices over the top for extra gloss.