Sparris Feta Frittata

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1. 1
   Preheat the oven to 400F.
2. 2
   In a 9-inch or 10-inch oven-safe non-stick skillet, heat olive oil over medium heat.
3. 3
   Add the onion and scallions and cook until soft, about 4 minutes.
4. 4
   Meanwhile in a medium bowl, beat the eggs and egg whites.
5. 5
   Add salt, black pepper, cheeses, sauteed onions and spinach and mix well.
6. 6
   Pour the mixture into the skillet and cook until the bottom sets, about 4 to 5 minutes.
7. 7
   Once the bottom sets transfer to the oven and bake 4 to 5 minutes.
8. 8
   To serve remove from the oven and transfer to a plate. Cut into 4 wedges.
9. 9
   Serve topped with fresh tomatoes and scallions.