• 1/3 cup olive oil
• 1 large onion, thinly sliced
• 2 large bunches spinach (about 1 pound), cut into ribbons and thoroughly dried
• 1 1/2 cups ricotta cheese
• 4 eggs
• 1 cup feta cheese, crumbled
• 1 tablespoon dried oregano
• salt and pepper, to taste

1. Preheat oven to 375 degrees F.
2. Heat the oil in a heavy pot over high heat. Add the onion and saute until translucent, about 3 minutes.
3. Add the spinach, in batches, if necessary, and saute until just wilted.
4. Lightly beat the ricotta and eggs together in a bowl.
5. Add the spinach mixture, feta, oregano, and salt and pepper to taste and mix thoroughly.
6. Pour the batter into a greased 9×13-inch pan.
7. Bake for about 40 minutes, until the top is very lightly browned. Serve warm or at room temperature.

This wonderful, simple and elegant dish is a crust-less version of a typical quiche.