½tspsalt(adjust based on the saltiness of the cheeses)
1cupplain flour
1tspbaking powder
Instructions
Preheat your oven to 180℃ (350℉).
Slice the onions however you like and sauté them in olive oil over medium heat for 10-15 minutes, until golden.
While the onions are cooking, grate the zucchinis using a medium grater or a food processor. Squeeze out as much liquid as possible with your hands over a colander or by twisting them tightly in a clean kitchen cloth.
In a large bowl, combine the grated zucchini, eggs, fried onions (including the olive oil from the pan), ricotta, feta, Parmesan, and salt.
Mix in the flour and baking powder until everything is fully combined.
Spread the mixture evenly into a greased baking dish or one lined with parchment paper.
Sprinkle any toppings you like, such as extra cheese or sesame seeds, to enhance the flavor and texture. I kept it simple by drizzling a little more olive oil and decorating with red onion slices and fresh oregano.
Bake in the oven for 40-50 minutes, or until the top is golden brown and set to your liking.
Let the quiche cool for about 15 minutes before slicing to help it hold its shape.