Slow Cooker Spinach and Mozzarella Frittata

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If you’ve yet to try our mouth-watering Spinach and Mozzarella Frittata, you don’t know what you’re missing! This slow cooker recipe creates a savory and filling breakfast that will have you coming back for more.

A frittata is a great alternative to a traditional omelet or scrambled eggs. It is easier to make, because there is no flipping or hovering over the stove. This slow cooker spinach and mozzarella frittata is made even easier because you toss the ingredients into the slow cooker and leave it to bake on its own. Like so many of the healthy slow cooker recipes featured on our site, this dish is easy, convenient, and filled with delicious, healthy ingredients. Whether you are searching for a breakfast or brunch option, or you need a dish to share for a special occasion, this is it.

Spinach and Mozzarella Frittata can be served hot or cold and goes perfectly with a garden fresh salad. We love to experiment by added sauteed mushrooms and goat cheese. What’s your favorite frittata add-in?

Slow Cooker Spinach and Mozzarella Frittata

Spinach and Mozzarella Frittata

Yields: 6 Servings | Serving Size: 1/6 of entire recipe | Calories: 139 | Total Fat: 8 g | Saturated Fat: 1 g | Trans Fat: 0 g | Cholesterol: 94 mg | Carbohydrates: 4 g | Fiber: 1 g | Sugars: 2 g | Protein: 12 g | SmartPoints (Freestyle): 3 |


  • 1 tablespoon extra virgin olive oil
  • 1/2 cup diced onion
  • 1 cup 2% shredded mozzarella cheese, divided
  • 3 eggs
  • 3 egg whites
  • 2 tablespoons 1% milk
  • 1/4 teaspoon black pepper
  • 1/4 teaspoon white pepper
  • 1 (packed) cup chopped baby spinach, with stems removed
  • 1 Roma tomato, diced
  • Salt to taste


  1. In a small skillet, add oil and sauté onion on medium heat until tender, about 5 minutes.
  2. Lightly spray the inside of the slow cooker with nonstick cooking spray. We like to make our own by filling this reusable cooking spray bottle with olive oil or canola oil.
  3. In a large bowl, combine sautéed onion, 3/4 cup mozzarella cheese, and remaining ingredients; whisk to combine, and pour into slow cooker. Sprinkle remaining 1/4 cup cheese on top of egg mixture. Cover, and cook on LOW for 1–1 1/2 hours, or until eggs are set and a knife inserted in the center comes out clean.

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Did you love our Spinach and Mozzarella Frittata? Do you have a favorite SkinnyMs. recipe? We’d love to hear about it. Tell us what you think in the comments section below.

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54 Comments on "Slow Cooker Spinach and Mozzarella Frittata"

  1. Maryann Tortorici Gr  June 10, 2012


  2. Ginapap9  June 10, 2012

    Definitely want to try this!

  3. Lacey Parker Somers  June 10, 2012

    Sounds delish!!! However I am thinking about using rotel tomatoes instead of roma. Give it a lil' kick!! and serve it for supper instead of breakfast!!! Thanks for the great ideas!!!!!! :))

  4. Dotty  June 10, 2012

    Just tried it. By far the best frittata ever!

  5. Dotty  June 10, 2012

    Just tried it. By far the best frittata ever!

  6. Tanbolton  June 10, 2012


  7. Tiffanydawnw  July 22, 2012

    did it take longer for anyone to cook?????  it has been 1 1/2 hours and mine is still eggy in the middle….putting it in the oven to finish cooking….but smells yummy

  8. Skinny Ms.  July 24, 2012

    Tiffany, How did it turn out?

  9. Sally Fuller  July 26, 2012

    I added turkey sausage to this recipe and it was great.

  10. Amanda  August 6, 2012

    This is for supper tonight! Yay!

    • Skinny Ms.  August 6, 2012

      Amanda, Great! Love frittatas for supper.

  11. Jennymartin116  August 12, 2012

    This is a delicious frittata…it is a fave… We have tweaked it sometimes when I don't have all the ingredients!

  12. Cloo  September 2, 2012

    Wondering how these are as leftovers? With just my husband and I it's bound to happen. Thanks for the info

  13. Skinny Ms.  September 2, 2012

    Never had leftovers. To be honest, I'm not big on leftover egg recipes…always best fresh out of the slow cooker. Let us know if you try it and what you think.

  14. Tray  October 21, 2012

    This is my favorite recipe from here so far. As previously mentioned, I have found it takes a little longer to cook than specified in the recipe. Usually about an hour and 45 minutes.

  15. Brooke  November 4, 2012

    One of my favorites for breakfast. I make this every other week!

  16. Deb_P  November 13, 2012

    If I double this recipe for a group, how much longer will it need to set?

    • Skinny Ms.  November 13, 2012

      Deb, 2 – 2 1/2 hours…check after 2.

  17. Leah  March 24, 2013

    Does it matter what size slow cooker to use?

  18. Tiffany  June 17, 2013

    Looks amazing! Can I use all whole eggs instead of 3 whole and 3 whites? Will it work out? Also, is it okay if I use my preferred veggies and cheese and add meat? Thanks!

    • Skinny Ms.  June 17, 2013

      Tiffany, Sure, 3 whole eggs will work. Use any veggies you like! 🙂

  19. Rebecca Odell  July 21, 2013

    Thanks for the recipe…Going to try it soon..

  20. Lynn  July 23, 2013

    Can you use egg subsitutes in place of eggs in this ?

  21. Fran  September 5, 2013

    Anyone bake this in a pyrex dish instead of using a slow cooker?? Afraid it won't come out easily

    • Skinny Ms.  September 5, 2013

      Fran, A pyrex dish should work. Be sure to spray the inside with a non-stick cooking spray before adding the egg mixture.

  22. Lori  October 4, 2013

    What size slow cooker did you use? I only have a 5 quart, and that seems too large.

    • Skinny Ms.  October 5, 2013

      Lori, I actually used a 6 quart…so yours will be fine.

  23. shana  November 3, 2013

    Wondering if you can double everything for a larger group and if so how would that impact the cooking time?

    • Skinny Ms.  November 4, 2013

      Shana, Yes you can double the recipe. Include 1-2 additional hours of cooking time.

  24. Alexis  April 12, 2014

    In the recipe description is says your recipe combines the flavor of garlic, but the recipe doesn't call for garlic?

    • SkinnyMs  April 13, 2014

      Hi Alexis, That should been onion. Just updated. Thanks! 🙂

  25. TB & BB  June 18, 2014

    taking way longer … whats v diff if i set it on high?

    • SkinnyMs  June 18, 2014

      TB & BB, If you set it on high usually you can minus 2 to 3 hours from the cook time.

  26. Iva  July 2, 2014

    Can you cook this on medium to speed up the cooking process?

    • SkinnyMs  July 2, 2014

      Iva, Yes you can.

  27. Betsy  July 8, 2014

    I'm confused. Directions are for cooking this in a slow cooker, but the photo shows it in an iron skillet. I'd love to try this recipe, but don't have time for a slow cooker for a morning meal. So has anyone tried it on the stove or in the stove?

    • SkinnyMs  July 8, 2014

      Betsy, You can cook this in the stove. After sautéing the onions, add the rest of the ingredients to the skillet, cover with foil, and heat in the oven at 350 for about 20 minutes to 1/2 hour.

  28. Kristin  October 28, 2014

    Can I subsitute the milk for water?

    • SkinnyMs  October 28, 2014

      Kristin, Yes you can.

  29. mary  February 10, 2015

    did anyone make it with frozen spinach?

  30. kitchenclogs  March 30, 2015

    This is a great recipe! My husband loves it and so do I. One time I forgot to put the milk in it and it didn't hurt it a bit, so now the only thing I do different is to not add the milk. Thank you for such a delicious and easy recipe. 🙂

  31. Becky  April 17, 2016

    I’m currently dairy free – will the consistency be altered if I leave out the cheese? Will I need more liquid?

    • Gale Compton  April 17, 2016

      Becky, I would increase the milk by another 2 tablespoons.

  32. Lissa  April 18, 2016

    How do you get it out of the crockpot looking so pretty????

    • Gale Compton  April 18, 2016

      Lissa, Very carefully! When we photograph food, it requires a lot of extra patience. 🙂

  33. Colleen W  February 4, 2017

    I made this today…

    For the egg whites, I used 3/4 cup of EggBeaters (Southwestern Style).
    It gives the dish a nice bit of zip.

    I set the timer for 2 hours and the frittata set quite nicely.

    Very simple to make and will be making this again.

  34. Michael  March 25, 2017

    What is the advantage of doing this in a slow cooker?

    It would seem that pouring the egg mixture into the saute pan after cooking the onions and then cooking at medium heat until the eggs set — like a regular frittata — would give the same, maybe better result faster and with one fewer pot to clean. (Finish it under a broiler, perhaps, to give the mozzerella toping a toast.)

    • Gale Compton  March 25, 2017

      Michael, Sure, using a saute pan works fine too.

  35. Phil  July 8, 2018

    I don’t know about your slow cooker but mine (original Crock-Pot) never browns on the bottom, as shown in your photo.

    • Gale Compton  July 9, 2018

      Phil, One of our favorite slow cookers does brown. There are other brands that do as well.

      • Kristie  December 28, 2019

        Hi, can this be done in the instant pot? Do you know what settings and time it would be?

        • Nichole Furlong  January 2, 2020

          Hi Kristie, this recipe is not the best for an Instant Pot.


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