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1
Combine flour, baking powder, and salt in a bowl. Add oil, egg, and yogurt. Add milk gradually until a smooth, pliable dough forms that does not stick. Form into a ball, cover in plastic wrap, and place dough in the refrigerator to rest for about 1 hour.
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2
Preheat the oven to 350 degrees F (175 degrees C). Oil a glass baking dish.
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3
Bring a large pot of water to a boil. Add spinach and cook for 1 minute. Drain and let cool.
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4
Heat oil in a large skillet over medium heat. Add onion and cook until transparent, 3 to 5 minutes. Remove from heat and let cool.
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5
Chop cooled spinach and combine with onion in a bowl. Add feta cheese, Cheddar cheese, then halloumi cheese. Season with salt and pepper. Add eggs.
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6
Take dough from refrigerator and knead on a clean surface. Divide into 2 pieces, 1 slightly larger than the other. Roll out larger piece of dough to cover bottom and sides of the prepared baking dish, using your hands to stretch the dough.
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7
Spread filling into dough-lined baking dish. Roll out remaining dough to fit and place on top of filling. Pinch sides to enclose filling. Cut a cross on top and brush lightly with milk.
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8
Bake in the preheated oven until golden on top and risen, about 45 minutes.
