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    Home > Recipes > Breakfast & Brunch > Sunday Brunch

    Caramelized Onion Frittata

    Published: January 2, 2019 By Urban Foodie Kitchen Last Updated: January 29, 2023 12 Comments

    Skip to Recipe Print Recipe

    This frittata gets an added flavor boost with a good dose of caramelized onions, making it a big hit for weekend brunches as well as special occasions.  

    Caramelized onion frittata in a grey cast iron pan

    You can never really go wrong by adding caramelized onions to a dish.  They give just about any savory dish an instant flavor enhancement from the natural sweetness that gets drawn out when you slowly cook onions.

    While frittata always makes a great weekend breakfast, it can also be a great option for a quick weeknight dinner.  You can serve it with a simple green salad, on top for fun, and if it's Sunday brunch maybe a mimosa or Bloody Mary!  I often make one on Sunday and have it for breakfast, and maybe even dinner, several times during the week.

    Leftover frittata is nearly as good as one that comes straight out of the oven which makes them a great option for feeding a crowd too.  Not to mention that they are also good at room temperature which is what makes them a great brunch buffet dish.  One frittata is enough for four to six people if it's the main dish.  If you are serving it on a brunch buffet I'd precut it into 8-10 slices since there are likely other goodies to eat with it.

    Slice of caramelized onion frittata on a blue plate

    How do you make a Frittata?

    Once you get the ingredients ratio down, you can pretty much make a perfect frittata every time.  If you have 8 eggs the possibilities are endless!

    In addition to 8 eggs you'll need a ¼ cup of milk.  I generally use 1 or 2% to give the mixture a little more substance.  Next, it's a bit of dijon mustard and some salt and pepper.  Whisk all of that together an then it's just a matter of the cheese and whatever veggies or meat you want to add.   I use half a cup of cheese and a cup of meat/veggies for 8 eggs.  That gives you enough to get some of each in every bit without being overwhelming.

    Egg mixture poured over frittata ingredients in pan
    Ingredients for frittata in cast iron pan

    Have fun experimenting with your own flavor combos.  I'd love to hear about the results in the comments or post photos on Instagram and use #urbanfoodiekitchen.  Enjoy!!


    things you may want for this recipe

    Cast Iron Skillet – You can actually use any oven-safe low sided pan for a frittata, however, I recommend an enamel coated cast iron pan like a Staub or Le Cruset as I think it gives you the best results.  And they are super versatile which makes them a kitchen must have.

    Caramelized onion frittata in a grey cast iron pan

    Caramelized Onion Frittata

    Author: Kathryn | Urban Foodie Kitchen
    This frittata gets an added flavor boost with a good dose of caramelized onions, making it a big hit for weekend brunches as well as special occasions.
    5 from 9 votes
    Print Recipe Pin Recipe
    Prep Time 10 mins
    Cook Time 20 mins
    Course Breakfast & Brunch
    Cuisine Italian
    Servings 4 -6 servings

    Ingredients
      

    • 8 large eggs
    • ¼ cup milk, 1% or higher
    • 1 tablespoon dijon mustard
    • ½ cup shredded swiss cheese
    • 1 cup caramelized onions*
    • 1 teaspoon dried sage
    • ½ teaspoon ground pepper
    • ¼ teaspoon salt
    • 1 cup baby arugula or microgreens
    • shredded swiss cheese for serving

    Instructions
     

    • Preheat the oven.  Move the rack to the middle position on the oven and preheat to 400°F.  Coat a 10-12" oven-safe skillet with olive oil spray.
    • Blend the ingredients.  Whisk the eggs, milk, mustard, sage, salt and pepper together in a large mixing bowl until well blended.
    • Assemble the frittata. Add the onions and cheese to the prepared pan. Pour in the eggs.
    • Bake the frittata. Put the pan in the oven and bake until the eggs are set, 8 to 10 minutes. To check, cut a small slit in the center of the frittata. If raw eggs run into the cut, bake for another few minutes; if the eggs are set, pull the frittata from the oven. For a browned, crispy top, run the frittata under the broiler for a minute or two at the end of cooking.
    • Cool.  Let the frittata cool in the pan for 5 minutes, top with baby arugula or microgreens and a bit of extra shredded cheese, then slice into wedges and serve.

    Notes

    1. Total time assumes you make the caramelized onions prior.  If you are making them at the same time, add about 60 minutes to your total time and make the onions before starting the rest of the frittata.
    2. Leftover frittata can be stored in an airtight container in the refrigerator for 3-4 days.
    Keywords : Sunday brunch
    Did you make this recipe?Tag @urbanfoodiekitchen on Instagram or hashtag it #urbanfoodiekitchen

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    Reader Interactions

    Comments

    1. Gloria says

      January 21, 2019 at 3:00 pm

      5 stars
      I am all about caramelized onions. So worth the effort they take to make. What a great recipe to serve for brunch or breakfast for dinner during the week.

      Reply
    2. Kiki Johnson says

      January 26, 2019 at 11:07 am

      5 stars
      WOW - can I just say that caramelized onions are my favorite thing to cook? I love watching them turn all golden and love how it makes my house smell like a restaurant! This frittata is a celebration of caramelized onion and is therefore already a winner in my book!

      Reply
    3. Kelly Anthony says

      January 27, 2019 at 9:57 am

      5 stars
      This frittata looks like it would be perfect for breakfast OR dinner! I love caramelized onions -- they make e-ver-ything better!

      Reply
    4. Michelle says

      January 27, 2019 at 11:09 am

      5 stars
      This looks and sounds delicious! I love any kind of frittata, but frittata with caramelized onions is definitely my kind of food. So tasty! x

      Reply
    5. Tammy says

      January 27, 2019 at 11:14 am

      This looks absolutely delicious! I'd love this for breakfast one morning 🙂

      Reply
    6. Elizabeth Leaver says

      January 27, 2019 at 2:50 pm

      5 stars
      This looks so good! I like to make frittatas for packed lunches and picnics too as well as for brunches. I've not made them with caramelised onions though, definitely need to try!

      Reply
    7. Jessica (Swanky Recipes) says

      January 27, 2019 at 3:21 pm

      I just got a new cast iron skillet for Christmas and I need recipes that will help naturally coat it. I've made a dutch baby pancake this week and I'm excited to make this for brunch next.

      Reply
    8. Sara says

      January 27, 2019 at 6:52 pm

      Oh my gosh - I have all of the ingredients for this! I have been OBSESSED recently with caramelized onions - I actually have been adding them to scrambled eggs every morning! This is such a gorgeous and more sophisticated way to do that, and I can't wait to try it!

      Reply
    9. Charity says

      January 27, 2019 at 8:59 pm

      5 stars
      We make big batches of caramelized onions and freeze them for quick meals..so you know I'll pulling this out for brunch next weekend!

      Reply
    10. Julie says

      January 27, 2019 at 10:06 pm

      5 stars
      I love frittatas and caramelized onions, but really what jumps out to me the most about this post is your beautiful photography. I love how you styled this; frittatas often aren't all that much to look at, but you wound up with gorgeous images!

      Reply
    11. jagruti says

      January 28, 2019 at 3:18 am

      5 stars
      Frittata with caramelized onion is just gorgeous, the sweetness from the onion makes this dish more delicious! This recipe is a keeper.

      Reply
    12. Jyothi (Jo) says

      January 28, 2019 at 4:21 am

      5 stars
      Oh my...that's gorgeous looking frittata. I'm in love with your photos and frittata , I can never say no to. Especially when it's so flavourful and so delicious!

      Reply

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