Preheat oven to 200°C fan-forced. Wash carrots, leave on a couple of centimetres of the tops if using Dutch.
Toast cumin seeds in a dry pan for 60 seconds until fragrant.
In a large roasting tray, melt butter over low heat on stovetop. Once it foams and turns golden brown (about 3 min), remove from heat. Stir in honey, cumin, thyme, garlic, salt.
Add carrots, toss to coat.
Roast 30-35 minutes, turning once halfway, until carrots are tender and edges deeply caramelised.
Tip onto a serving plate, dollop yoghurt in spoonfuls, scatter pepitas and herbs. Serve with pan juices drizzled over.