1. Sauté the zucchini, sliced into thin rounds, in olive oil with finely chopped onion.
2. Cut the tomatoes and goat cheese into small pieces.
3. Mix the eggs, flour, and baking powder.
4. Then add the tomatoes, goat cheese, and zucchini, which should be cut into small pieces after cooking.
5. Put the mixture in a buttered cake pan (unless using a flexible mold).
6. Bake for 35 minutes in a preheated oven at 180°C (350°F).