Instructions

1. Preheat oven to 450 F. Place highest baking rack in the middle of the oven.
2. When oven has reached 450 F, place a glass pie pan or 8 x 8 casserole dish in oven to heat up.
3. In a large bowl, combine wet ingredients: whole eggs and egg whites, feta cheese, milk, herbs and a teaspoon of salt and ¼ teaspoon pepper. Whisk well for about a minute to break up the cheese and set aside.
4. Sauté vegetables. In a large skillet, heat up 1 ½ teaspoons olive oil. Add chopped onion and cook over medium heat, stirring occasionally, until translucent, about 5 minutes. Add a few tablespoons of water to the pan if onions start to stick.
5. Add artichokes and spinach and cook until spinach wilts, about 5 minutes.
6. Remove from heat, add in tomatoes, ½ teaspoon salt and a pinch of pepper and stir to combine.
7. Remove pan from hot oven. Spray with Pam and carefully load hot vegetables into the bottom of the pan.
8. Pour the egg mixture over the vegetables. Sprinkle shredded cheddar or parmesan on top and bake in the oven for 15 minutes, then reduce oven to 350 F and bake another 10 minutes, until frittata is firm and top is golden and puffy.
9. Remove frittata from oven and let cool before slicing.