- Peel and slice the onion, carrot and potato; peel and mince the garlic cloves. Preheat the oven at a temperature of 400?F. Put together the potato, garlic, onion, carrots, nutmeg, half-and-half and salt in a large bowl; toss them well.
- Take an oven-proof baking dish; place the carrot mixture in it top with the fresh thyme. Cover and then bake for 1 hour until all the liquid is disappeared. Remove the cover and then bake for 10 minutes to allow the gratin to brown until the top is golden brown.
- Leave for 30 minutes and then serve Potato Carrot Gratin Recipe top with the thyme.