Preheat oven to 180 degrees C. Spray a 20x30cm baking pan with cooking spray.
Heat the oil in a frypan over medium heat. Place eggs and breadcrumbs in two separate bowls. Dip eggplant slices in eggs, then in breadcrumbs to coat. Fry coated eggplant slices in the frypan until golden brown on both sides. Season with salt, and drain on paper towels.
In the prepared baking dish, layer eggplant, onion, tomatoes, parmesan cheese and feta cheese. Top with mozzarella.
Bake 30 minutes in the preheated oven, until cheese is melted and bubbly.
I found this recipe searching for a way to use up some eggplant. It was good, but a tad bland and had a bit too much cheese. I stirred some mixed herbs and pepper into the breadcrumbs, and as we're not eating fried foods I put the breaded eggplant in unfried. They came out fine. My husband loved it, so I'll be making this again. - 11 Oct 2014