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Preheat the oven to 180° C / 356° F.
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Roll out and cut the puff pastry to form 2 circles, each of 7.5 inches in diameter.
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Spread baking paper on a baking dish and place both of the pastry circles on it.
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Arrange the potato slices over the pastry, leaving a 1 inch border all around.
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Sprinkle the cheddar, smoked bacon and thyme over the potatoes.
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Fold the pastry over, and press the edges together with your fingertips where the edges overlap.
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Brush the butter over the potatoes. Salt to taste.
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Egg-wash the folded pastry.
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Bake for 17 minutes.
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Garnish with the fresh thyme.