Adjust an oven rack to the middle position and preheat oven to 450 degrees. In a large bowl, add carrots, olive oil, rosemary, thyme, and salt and pepper (I like at least 1/2 teaspoon salt and 1/4 teaspoon pepper) and toss until evenly coated.: As the oven warms you will notice the air filling with dry, hot heat that promotes quick browning. Preheating fully is critical because the immediate exposure to high heat triggers caramelization on the carrot surfaces, producing those desirable browned edges. A common misstep is placing the tray into an oven that is not fully up to temperature, which can lead to steaming rather than roasting, producing softer, less flavorful results. Use an oven thermometer if your oven runs cool, and position the rack in the middle so heat circulates evenly around the tray.
Transfer to rimmed baking sheet and spread in an even layer. Roast until carrots are fork tender and browned, about 20 to 25 minutes. Serve with yogurt sauce if desired.: The tactile action of tossing makes a difference; you should feel the olive oil coat each carrot piece and see flecks of herb and seasoning cling to the surface. This even coating ensures consistent browning and flavor distribution. If pieces are clumped together, they will steam instead of roast, so spread them apart in the next step. Watch for over-salting, especially if you will serve with a salty main dish.
Transfer to rimmed baking sheet and spread in an even layer.: When you arrange the carrots give each piece breathing room, so air can circulate and they can brown on multiple sides. A rimmed baking sheet captures juices and prevents spillover, while an even layer keeps roasting consistent. Crowding is the most common error here, leading to uneven textures where some pieces will be golden and others pale and soft. If necessary, use two sheets to avoid crowding.
Roast until carrots are fork tender and browned, about 20 to 25 minutes.: As they roast you will hear a faint pop and the kitchen will smell sweet and toasty. Check visually for deep golden brown edges and a slight collapse in the center when you press with a fork. The high heat helps the exterior crisp while the interior cooks to tender. Overcooking can make them mushy, so begin checking at 20 minutes; if you want more color, rotate the pan and roast a few minutes longer, watching carefully to avoid burning.
Serve with yogurt sauce if desired.: The warm carrots paired with the cool, tangy yogurt sauce create a delightful contrast in texture and flavor. Spoon the sauce alongside or drizzle lightly, allowing some carrots to remain uncoated for those who prefer plain. A frequent oversight is adding the sauce too early, which can make the carrots soggy; keep it chilled until serving so the contrast remains bright and refreshing.