1Using a food processor, slice the potatoes into 1/8-inch thick slices and place in a bowl.
2Add the cream, salt, pepper, thyme and garlic to the potatoes and mix to coat.
3Layer the potatoes in a 8-inch square baking dish. Pour over the cream that is left in the bowl and sprinkle with the cheese. Cover with a sheet of baking paper then foil. The baking paper stops the cheese sticking to the foil.
4Insert the wire rack into position 6. Set the oven to Bake, Convection, 350°F, for 1 hour 15 minutes, enable Rotate Remind and press Start to preheat.
5Once preheated, place the dish in the oven and cook for 1 hour 15 minutes. When the Rotate Remind signals, rotate the dish, remove the foil and baking paper and continue cooking.
6The gratin should be golden brown. If not, bake it a little longer.
7Sprinkle with chives and cracked pepper and serve.