Slice eggplant and potatoes into 1/2 inch (1 cm) thick slices and brush with some of the oil and sprinkle with 1/2 tsp (2 mL) each of the salt and pepper and dried oregano. Place on parchment paper lined baking sheets and roast in preheated 400 F (200 C) oven for about 25 minutes, turning once until tender and light golden.

Meanwhile, heat remaining 1 tbsp (15 mL) of the oil in saucepan and cook onion and garlic for 2 minutes. Stir in parsley, fresh oregano, cinnamon and allspice. Add passata, remaining 1/4 tsp (1 mL) salt and pepper; bring to a simmer. Simmer for 10 minutes.

Ladle half of the sauce into casserole dish. Layer half of the eggplant and potatoes on bottom. Sprinkle with half of the feta cheese. Repeat with remaining ingredients.

In a bowl, whisk together yogurt, eggs, cheese and flour. Spread evenly over top and bake in preheated 350 F (180 C) oven for about 1 hour or until golden and set. Let stand about 15 minutes before serving.