Healthy Greek Frittata!

We have been making this healthy Greek Frittata. It's funny. I have a bad heart and the wife has the sugar but our cholesterol is fine. So we enjoy frittatas. This one is made with onion, black olives, fresh tomato, seven whole eggs, three egg whites and topped with feta cheese. After sautéing the onion till translucent throw in the cut up fresh tomato and black olives. Then mix in the eggs and bake for twenty minutes. Add the feta at the end. Very tasty.