Remove the puff pastry from the freezer and let it thaw.
Preheat oven to 375°F.
Meanwhile, prepare the filling. Peel and cut potatoes into thin slices, layer the slices on a baking sheet, and drizzle with olive oil, salt, and 1/2 tsp Liyye seasoning. Mix well then bake for 20 min or until the potatoes are golden and fork-tender.
In a pan, heat 1 tbsp olive oil add the onion and sauté, cook until fragrant. Add the spinach, 1/2 tsp of Liyye seasoning and salt let it cook until the spinach wilts down.
Unwrap the dough and place it on a baking sheet. Fold the edges all around.
Spread the spinach mixture, sprinkle with cheese, layer the potato slices on top then sprinkle the top with cheese again and a few slices of butter.
Brush the edges with milk or egg wash.
Bake in the oven for about 15 min or until golden crispy.