Preheat your oven: to 180°C / 350-375°F / Gas Mark 4-5.
Skillet: spray a 26cm (10 inch) round or approx same size baking dish with cooking oil and set aside.
Potatoes: use a vegetable peeler and chopping board to peel each of the potatoes. Then use a mandolin to thinly slice the potatoes.
Seasoning: transfer the sliced potatoes to a mixing bowl. Then add the dried onion, thyme, salt and pepper and use a spoon to stir to combine.
Cheese and cream: add half of the cheese to the potatoes and then pour in the cream and use a spoon to gently stir until the mixture is consistently combined.
Skillet: transfer the creamy potato mixture into the skillet and cover.
Oven bake: place the skillet or baking dish onto the middle rack of the oven and bake (covered) for 30 mins.
Cheese: use oven mitts to remove the skillet from the oven and place it onto a heatproof surface. Then discard the foil and cover the top of the dish with cheese.
Return to oven: place the potatoes back into the oven (uncovered) and bake for 10 minutes to allow the cheese to melt and turn golden brown. To ensure that the potatoes are cooked through, use oven mitts to remove the potato bake and place it onto a heatproof surface. Then use a skewer and push it directly down into the potatoes. If it goes straight through, they are ready. If there is any resistance, return the potatoes to the oven until you test again and there is no resistance. Note 3
To serve: let the potato bake sit for 5 to 10 minutes once removed from the oven so that it settles. Then garnish with the chopped parsley and serve.