The feta cheese and Kalamata olives make this a Greek frittata.
This is a recipe where you can vary the flavor profile by varying the amounts of the ingredients. Add more feta cheese to make that more dominant. Or reduce the number of Kalamata olives to lower their presence in the frittata. (I would recommend these directions for making modifications.)
1 cup coarsely chopped spinach
1/4 cup feta cheese plus more for the top
8 Kalamata olives, cut into quarters lengthwise
Put the eggs into a good-sized mixing bowl and beat just to mix them up. Add a bit of oil to the pan and let it get hot. Add a small amount of the eggs to the pan to set the bottom of the frittata to prevent sticking. Turn the heat down to medium low. Mix the spinach, cheese, and olives into the eggs. Pour the mixture into the pan. Cook this for about 5 minutes to set the bottom and sides.
Preheat the broiler. When the 5 minutes cooking on the stove are up, sprinkle on additional feta cheese and place the pan under the broiler, about 6 to 7 inches below. Cook until the top is set and just starts to brown. This is about 1–1/2 to 2 minutes for me, but watch closely.
Remove from the broiler, loosen up the sides with a spatula if necessary, and slide the frittata out onto the serving plate.