What is a frittata? The frittata is the Italian cousin to quiche - basically a big, veggie-packed omelet. The traditional cooking approach often involves stirring, broiling or (eek!) flipping the eggs to make sure it's fully cooked and golden brown. This easy spinach frittata recipe skips the tricky bits: Instead, the eggs cook all the way through in the oven. The recipe is a Yummly original created by Edwina Clark, RDN. Don't forget at least a pinch of salt and a few good grinds of black pepper. Frozen spinach works perfectly as long as you thaw it and squeeze out the extra water before adding it in. For good looks and a punch of bright flavor, you can “float” a few grape tomatoes on top of the egg mixture right before it goes into the oven. So...just veggies? Heavens no. Meat, cheese, and milk are all welcome additions. Parmesan cheese is the classic flavor booster, but anything you’d put in an omelet works: sausage, cheddar cheese, swiss cheese, ham, up to a 1/4 cup of cream or whole milk. If you add bacon, you can skip the salt. If you leave out meat and cheese entirely, you may need up to one teaspoon salt. Be sure to cook any meat ahead of time: A few minutes in a frying pan on medium heat will do it for bacon. Whatever your final mix, ground black pepper is a must-have. How to cook a frittata Remember to preheat the oven just as soon as you get into the kitchen - part of the secret to the gloriously quick cooking time (total time of 15 to 20 minutes) is high oven heat (425º F). You’ll need all of your sundried-tomato-cutting / egg-whisking time for the oven to preheat. Pan size is somewhat flexible: A 10- or 12-inch cast-iron skillet or non-stick frying pan is perfect for this. However, if you don’t have either, improvise: A pie pan, well coated with nonstick spray (or olive oil or butter), will also work. Read Less