Spinach and Cheddar Frittata
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Eight eggs, onion, pepper and spinach in a skillet that goes from stove to oven. It's breakfast today, lunch tomorrow, and a cold slice eaten standing at the open fridge at midnight.
The short version
Cook the vegetables until dry, pour in 8 eggs whisked with a little milk and cheese, set the bottom edge on the stove for 3 minutes, then bake at 350°F for 12 to 16 minutes until the center is just set. Rest 5 minutes.
What makes ours better
why ours wins the argument at dinner
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Cook the vegetables until dry. Raw or wet vegetables leak water into the eggs and leave a soggy, pale frittata. Cooking them until the liquid evaporates gives you a clean, firm slice with more flavor.
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Whisk in a splash of milk, not a lot. A few tablespoons make the eggs tender. Too much dairy makes the frittata watery and weeping, like a poorly set custard.
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Start on the stove, finish in the oven. The burner sets the bottom and edges so it releases from the pan, and the oven's gentle heat cooks the center evenly without turning the eggs rubbery.
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Pull it while the center is just set. Eggs keep cooking in the hot skillet. Taking the frittata out while the center barely jiggles gives you a tender center after the rest.
What you need
the stars of the show
- Olive oil2 tablespoons
- Yellow onion1 small
- Red bell pepper1 medium
- Baby spinach5 ounces
- Garlic1 clove
- Eggs8 large
- Whole milk¼ cup
- Shredded sharp cheddar¾ cup
read it twice. buy it once.
Steps
go slow. the good part can’t be rushed.
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Heat the oven
Set a rack in the middle of the oven and heat it to 350°F. You need a 10-inch oven-safe skillet; cast iron or nonstick with a metal handle both work.
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Cook the vegetables dry
Heat the oil in the skillet over medium heat. Cook the onion and bell pepper, stirring, for 6 to 8 minutes until soft and just starting to color. Add the garlic for 30 seconds, then the spinach in handfuls, stirring until it wilts and the pan is nearly dry, 2 to 3 minutes.
If you see liquid pooling in the pan, keep cooking. Wet filling is what makes a frittata watery.
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Whisk the eggs
In a large bowl, whisk the eggs, milk, salt and pepper until the yolks and whites are just blended and no clear streaks remain. Stir in most of the cheese and the herbs.
Don't whisk until frothy. Extra air puffs up in the oven and then collapses.
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Pour and set the edges
Reduce the heat to medium-low and spread the vegetables evenly across the pan. Pour the eggs over them. Cook without stirring for 3 to 4 minutes, until the edges look set and the center is still loose. Scatter the remaining cheese on top.
About 4 min. Cook mode has a timer for this step.
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Bake until just set
Slide the skillet into the oven and bake 12 to 16 minutes. It's ready when the top is puffed and lightly golden and the center barely jiggles when you shake the pan. A knife in the center should come out clean, with no wet egg on it.
About 14 min. Cook mode has a timer for this step.
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Rest and slice
Let it stand for 5 minutes; it will deflate a little and finish setting. Run a rubber spatula around the edge, then cut into wedges and lift out of the pan.
The skillet handle stays hot. Drape a towel over it right away so no one grabs it.
About 5 min. Cook mode has a timer for this step.
Good to know
things I learned the hard way, so you can skip that part
- Any filling works. Use about 2 cups total of cooked, well-drained vegetables or meat, such as mushrooms, zucchini, potatoes, ham or crumbled sausage. Cook the firmer ones first.
- Cast iron gives the best browned bottom. In a nonstick pan, start with a slightly lower stovetop heat.
- For a 12-inch skillet, use 10 eggs and add 3 to 4 minutes to the bake time.
- Storage. Fridge, 4 days, covered. Eat cold, at room temperature, or reheat wedges in a 300°F oven for 10 minutes or the microwave for 45 seconds. Freeze wedges up to 2 months.
Questions, answered
asked and answered at the kitchen counter
What is the difference between a frittata and an omelet?
An omelet is folded around its filling and cooked quickly on the stove. A frittata has the filling mixed into the eggs, is cooked slowly, and is finished in the oven, then cut into wedges like a pie.
Why is my frittata rubbery or watery?
Rubbery means overcooked, so pull it when the center still wobbles slightly. Watery means wet vegetables or too much dairy; cook the filling until dry and keep the milk to ¼ cup.
How do I keep a frittata from sticking?
Use plenty of oil, a well-seasoned cast-iron or good nonstick skillet, and let the frittata rest 5 minutes before you loosen the edge with a spatula.
Can I make a frittata without an oven-safe skillet?
Yes. Cook the vegetables in any pan, move them to a greased 9-inch pie plate, pour over the eggs and bake at 350°F for 25 to 30 minutes.
Can I make a frittata ahead of time?
Yes. It keeps for 4 days in the fridge and tastes fine cold or reheated, which makes it good for meal prep and picnics.
From the table
Made it? I want the full report: first bite, best compliment, and who tried to take the leftovers home.
Made it?
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Published October 28, 2026.