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Place butter, cream and garlic in a jug. Mix until combined.
Preheat oven to 350F/180C.
Peel the potatoes and slice them 1/8"/3 mm thick. Or use a slicer!
Spread 1/3 of the potatoes in a baking dish (Note 3), then pour over 1/3 of the cream, scatter with 1/3 of the salt, pepper and thyme. Sprinkle with 3/4 cups cheese.
Repeat for the 2nd and third layer, but do not finish with cheese on the top layer (will add later).
Cover with lid or foil, and bake for 1 hr 15 min or until the potatoes in the middle are soft (use knife to test).
Remove foil, top with cheese. Bake for a further 10 to 15 minutes until golden and bubbly. Stand 5 minutes before serving.