Preheat oven to 190C.

Line a large baking tray with foil and spray it with the olive oil spray. Arrange sliced aubergine in a single layer on the baking tray, spray with cooking spray, grate some salt over, and roast in oven for 10 minutes. Turn the sliced aubergines over and roast for a further 10 minutes.

Meanwhile, Whilst the aubergine is roasting, heat the olive oil in a large pan over a medium heat, then add the onion and sauté for 2 minutes then add the meat and cook until meat is browned, about 5 minutes, stirring frequently and breaking it up as it cooks. Add the garlic and cook 1 more minute.

Stir in the tomatoes, tomato puree, oregano, cinnamon, cumin and black pepper. Cook, stirring occasionally for about 10 minutes until thickened.

Spray an ovenproof casserole dish with the cooking oil spray.

Arrange half of the roasted aubergine slices in the bottom of the casserole dish. Spread the meat mixture over the aubergine slices and press down to flatten. Then cover the meat mixture with the remaining aubergine slices.

Whisk the eggs and yogurt together and pour over the top of the moussaka. Sprinkle the cheese on top. Bake in oven for 15 - 20 minutes until the top is golden and bubbling.

Remove from oven and allow the moussaka to slightly cool and set. Cut into 6 portions and serve.