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Preheat oven to 400°F (200°C). Grease or line a baking dish.
Par-cook the potatoes:
Boil the thin potato slices for about 5–6 minutes until just tender. Drain and set aside.
Make the cheesy sauce:
In a saucepan, melt butter over medium heat.
Add garlic and onion (if using), sauté until soft.
Stir in flour, cook 1 minute.
Slowly whisk in cream, stir until thickened.
Add salt, pepper, and herbs. Stir in shredded cheese until melted.
Fold in diced ham. Remove from heat.
Assemble the bake:
Roll out the puff pastry slightly to fit your dish.
Lay half the pastry into the dish, pressing it into corners.
Layer potatoes and cheesy ham sauce.
Top with remaining pastry like a pie, or just lay it over and crimp the edges.
Cut slits for steam to escape. Brush with egg wash.
Bake for 25–30 minutes, or until golden and puffed. Let sit 5–10 min before cutting.
📝 Tips:
Want it extra decadent? Add a layer of caramelized onions or sprinkle crispy bacon on top.
Frozen diced hash browns can be used instead of fresh potatoes in a pinch.
Use a pie dish, square baking dish, or even a sheet pan—just adjust pastry size!
Want me to make it vegetarian, spicy, or customize it for a crowd?
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