Cast Iron Frittata

A frittata is the friendliest thing you can cook in a cast iron skillet: soften whatever vegetables and cheese you like right in the pan, pour beaten eggs over the top, let the edges set on the stovetop, then slide the whole skillet into the oven to finish. One pan, no flipping. A well-seasoned skillet lets the finished frittata release cleanly, and the pan's even heat sets the eggs gently so they stay tender rather than rubbery.

Why cast iron for this

A frittata needs a pan that can start on the stove and move to the oven, and cast iron does both without a second thought — no plastic handle to worry about. Its even, retained heat sets the eggs gently and uniformly, which is what keeps them custardy instead of tough. Just as important is release: eggs are notorious stickers, but a well-built layer of seasoning gives the iron a naturally slick, non-stick surface that lets a frittata slide free. If your pan is smooth and well-seasoned, eggs are genuinely easy; if it is new or bare, work on the seasoning first. For egg technique in general, our how to cook eggs in cast iron guide covers the details, and a smooth pan helps — see smooth vs rough cast iron.

Ingredients

• 8 large eggs
• ¼ cup (60 ml) milk or cream
• ½ teaspoon salt and black pepper
• 1 tablespoon olive oil or butter
• 1 small onion, thinly sliced
• 1 bell pepper or a big handful of spinach (or both)
• ½ cup (about 60 g) grated cheese
• Fresh herbs, chopped, to finish

Method

1. Heat the oven.Set the oven to 375°F (190°C) so it is ready when the frittata is.
2. Beat the eggs. Whisk the eggs with the milk, salt, and pepper until fully combined and a little frothy. The splash of dairy makes the set softer.
3. Soften the fillings. Warm the oil or butter in a 10-inch cast iron skillet over medium heat and cook the onion and pepper until soft, about 6 minutes; if using spinach, add it at the end and let it wilt. Spread the fillings into an even layer and scatter the cheese over.
4. Add the eggs and set the edges on the stove.Pour the beaten eggs evenly over the fillings. Let the frittata cook undisturbed on the stovetop for a couple of minutes, until the outer edges just begin to set — this gives it a base and helps it release later.
5. Finish in the oven.Transfer the whole skillet to the oven and bake 10 to 14 minutes, until the center is just set and no longer jiggly. Remember the handle is now oven-hot — grab it with a mitt.
6. Release and serve. Let it rest a couple of minutes, then run a spatula around and under the edge. From a well-seasoned pan it slides right out onto a board or plate. Scatter the herbs, slice into wedges, and serve warm or at room temperature.

Tips and troubleshooting

The two frittata problems are sticking and overcooking, and both are avoidable. For clean release, use a well-seasoned pan and enough fat; if eggs stick every time, your seasoning needs work more than your technique does, and the right seasoning oilhelps build it. For tender eggs, pull the frittata the moment the center sets — carryover heat in the hot pan finishes it, so an extra few minutes in the oven is what makes eggs rubbery. Do not overload it with wet fillings; drain watery vegetables first or they weep into the eggs. This is a forgiving, use-what-you-have dish — leftover roast vegetables, herbs, and odds of cheese are all fair game. Once you are comfortable with eggs releasing from the pan, a skillet is suddenly good for far more than dinner, right down to a skillet cookie for dessert.