1. Brown zucchini slices in olive oil over medium heat. Turn to brown on both sides. Set aside.
2. Brown onion, peppers and garlic, 4 minutes, stirring. Add more oil if necessary.
3. Add the tomatoes, tomato sauce, mint, salt and pepper. Cook 2 minutes more.
4. Grease a baking dish and cover the bottom with zucchini slices. Spoon half of tomato mixture over the zucchini, top with cheese slices. Spoon the rest of tomato mixture and top with a layer of zucchini.
5. In a bowl mix the flour, egg yolks, grated cheese, salt and pepper. Pour over the zucchini. Bake uncovered in a 350ยบ oven, for 25 minutes or until golden. Serve hot.