Heat oven to 190 C / Gas 5. Season aubergine slices and brush with oil. Roast for 40 min until soft and golden. Set aside and cool.
Lower oven to 150 C / Gas 2. Oil a 19cm square baking tin. Whisk feta, cream cheese, eggs and some pepper together until thick. Arrange aubergine, tomatoes and maybe some olives in the tin. Pour enough cheese into the mix to leave some aubergine and tomatoes exposed. Sprinkle over oregano. Bake for 30 mins.
Let cool. Mix za'atar or other spice with olive oil, spoon over, serve immediately.
Mix in other Mediterranean things: olives, peppers, spiced stuff.