Olive-oil
2 medium potatoes, peeled and sliced in 1/8-inch rounds
1/2 cup diced onion
8 oz (about 8 cups) baby spinach
3 kalamata olives, pitted and chopped
2 whole eggs
3 egg whites
1 cup nonfat ricotta or fat-free cottage cheese
1 tbsp feta, crumbled
3 tbsp finely chopped fresh basil or dill, or 3 tsp dried basil or dill, divided into 2 equal portions
3 Roma tomatoes, sliced into 1/4-inch rounds-optional
1 1/2 tbsp grated Asiago or Parmesan
1 1/2 tbsp grated lowfat mozzarella