1. Preheat oven to 400°.

Put carrots on large rimmed baking sheet, drizzle with olive oil.

Bring a large pot of water to a boil over high heat and add potatoes. Boil for about 5 minted till fork tender.

While potatoes are boiling, roast carrots in oven, when potatoes are done, drain them completely and spread on a large rimmed baking sheet with carrots, drizzle vegetables with olive oil, season generously with salt and pepper, and gently toss to coat evenly. Bake, stirring occasionally, until potatoes are golden brown, about 20 minutes.

Transfer vegetables to a large bowl and add thyme and butter or margarine; gently toss to coat evenly. Serve warm or at room temperature.