These 21 Day Fix Mason Jar Egg Casseroles are a perfectly portioned and portable make ahead breakfast for the 21 Day Fix! This post contains affiliate links for products I’m obsessed with.Â
Confession #119 – I was recently featured on a local news segment and was nervous as hell about doing live TV.
I didn’t even tell anyone it was happening until right before.
But it actually went really well. Â I always say I’m most comfortable in the kitchen…and apparently a studio kitchen on TV is no different.
And if I can be totally honest, it fulfilled a crazy old dream of this girl’s…dating back to watching Julia Child with my grandmother in the 80s.
I always wanted to have my own cooking show.
My grandma used to give me a pot, some uncooked spaghetti and a wooden spoons and I used to not only pretend to cook, I would narrate what I was doing to an imaginary audience.
This was pre-food network, people. Â
Anyway, I never actually thought this dream would happen or even tried to pursue it…so it was more of a daydream than anything. And while doing a quick cooking demo on the local news might be as close as I come to a real cooking show, I’m still counting it as dream fulfilled! Â When it’s your dream, you can do that, right?
Anyway, if you didn’t see it live, I demonstrated two make ahead breakfast ideas – my 21 Day Fix Baked Oatmeal Jars and these adorable and delicious egg casseroles.
I love a good breakfast casserole, but always have trouble sticking to just one piece. Â I mean…bacon, egg and cheese anything is just so freaking good.
That’s why portioning these out into cute little mason jars BEFORE cooking helps you stay on track, plus they are perfectly portable without dirtying a single additional plate or container.
I used cauliflower rice as the base of my casserole, and followed a similar layering technique as I did in my 21 Day Fix Crock Pot Breakfast Casserole, but I only did one layer of all the ingredients.  If you still aren’t sure about cauliflower rice, you could easily add roasted potatoes or sweet potatoes to the bottom of your jar. Still on plan!  But I’m always looking for ways to save yellows and add in more veggies.
And I used turkey bacon, but these would be really yummy with breakfast sausage if that’s your thing! Â One thing I will caution – the egg mixture tends to stick to the mason jars, so you really need to spray them well before filling. Â Otherwise, this is such an easy breakfast to prep ahead and even have your kids help you make before a busy week!
You can use any size mason jar for this, but I love these 16 oz wide mouth jars the best!
I can’t wait to make more Mason Jar breakfasts and share them with you all!
21 Day Fix Mason Jars Egg Casserole
Ingredients
- 6 extra large eggs
- 1/3 cup unsweetened original almond milk or milk of your choice
- 2 cups cauliflower rice
- 1 cup diced bell peppers or veggies of your choice
- 6 slices turkey bacon crumbled, or 6 links of diced poultry breakfast sausage
- 2/3 cups shredded cheddar cheese or cheese of your choice you can double this amount and just count it as a full blue
- Salt
Instructions
- Preheat oven to 375 degrees and spray four, 12 oz or larger mason jars liberally with cooking oil spray.
- Add ½ cup of cauliflower rice to each jar and sprinkle with salt. Next, add in veggies and breakfast meat.
- Scramble eggs and whisk in milk. Divide egg mixture evenly among the 4 jars. Again, sprinkle with a little salt.
- Top evenly with shredded cheese and bake on a baking sheet uncovered for 25-30 minutes or until egg is set and the cheese begins to brown.
- Cool completely, then cover and store in the fridge for 3-4 days. To warm, remove cover and heat in the microwave for 1 minute.
Notes
Nutrition
Sarah says
Can these be warmed in a pot of hot water, or another way, instead of the microwave?
Nancylynn says
Sure! You can throw them back in the oven until warm!
Diane taylor says
Can you put lids on hot jars to seal them like you do cake in a jar
Nancylynn says
For best results, I would let them cool completely before putting the lid on.
Kathryn says
Hi Nancylynn
I am trying to make these. Can you put the mason jars in the oven? I have all new jars.
Nancylynn says
I do! And no issues for me so far!
Winniebear says
Wow…live TV? That had to be so awesome! Congratulations. Also, thank you for posting this. I’m always looking for ways to mix up my morning food and this is a fantastic idea. I have everything except the cauliflower already. I think I’m going to try quinoa and see how it goes.
Nancylynn says
Oooh yum! And yes, live tv! But it feels like a lifetime ago now!
Amy says
Just made this and it’s fantastic. Have not found a ton of cauliflower rice recipes I like, but this is definitely a keeper. Just started portion fix yesterday and thrilled to have found your site. So many recipes sound delicious. I was concerned as many of the recipes with the plan don’t seem applealing to me which means this new way of eating would be unsuccessful. However, your recipes have food I want to eat and that I can get my whole family on board with. The meal plans are awesome and I look forward to trying many more yummy dishes. Thank you!!!
Nancylynn says
This is exactly why this site exists, Thank you! So happy you are feeling set up for success with the recipes!
Kelli Fitzgerald says
So my first attempt didn’t cook the egg all the way through (found out while eating this morning.. ugh. Any advice on how to salvage the ones still in the fridge without burning them?
Nancylynn says
Bummer! You can cook them some more in the oven, or when you heat in the microwave put it in for a little extra time so that it can finish cooking. I would start with an extra 45 seconds at a time and keep checking them.
Jeanette says
I don’t own mason jars – I have young children and limit the amount of glassware in the refrigerator. Do you think This could be done using plastic Tupperware and a microwave?
Nancylynn says
I think your best bet is to use a baking dish (8×8) to cook in the oven and then transfer to tupperware containers for storage in the fridge. I would avoid cooking the casseroles in plastic in the microwave, if you can!
Annie says
I really want to make this but I keep reading that mason jars are not oven-safe! Any suggestions for something else to cook it in?
Nancylynn says
Try the original crock pot version-
https://confessionsofafitfoodie.com/21-day-fix-crock-pot-breakfast-casserole-3/
Ashleigh says
If you use sweet potatoes as the base, do you cook them first before baking in the jars?
Nancylynn says
If they were riced sweet potatoes, I think you could add them raw. Any larger and I would give them a little saute first!
Mary says
Quick question, when it writes in the recipe – SCALE 1x, 2x, 3x,
Does that mean that 1x is one portion?
Because 6 eggs seem like 2 portions.
Nancylynn says
No – that is to double or triple the recipe!
Jessica says
What size jar do you recommend for this?
Nancylynn says
These!!! (affiliate) https://amzn.to/37drAln
Jennifer says
How long would these stay for in the freezer?
Nancylynn says
three months
Kayla says
Should you freeze them before baking?
Nancylynn says
Nope! You can bake and then freeze!
Siobhan says
Hello, could you use 8 regular eggs (so 2 eggs per mason jar) if we weren’t adding bacon or turkey sausage? Or just add more red to our total if we do use bacon or sausage? I don’t ever have XL eggs on hand.
Nancylynn says
Sure! That works fine!
Titeta D Foote says
Hi,I wanted to see if you could use another base
Nancylynn says
Sure! You can use potatoes or sweet potatoes…or whatever you want!
Liz says
How long would you microwave these if you do not cook them ahead of time?
Nancylynn says
I’m sorry I didn’t see this- just a minute or two!
Kristen Scala says
Do you think that if made on a Sunday that these will last until Friday? I like to meal prep for the week.
Nancylynn says
I think they would! They also freeze well!
Rebecca cochell says
wish that you would put the net carbs fat and protein amounts
Nancylynn says
Hi Rebecca- I have been thinking of adding them, I just don’t always find the online calculators to be all that reliable. I will keep looking!
Holly White says
What other containers could be used instead of mason jars?
Nancylynn says
I love the small pyrex ramekins!
Tina Pratti says
You were on TV with my cousin Eve. Isn’t she the sweetest person ever.
Nancylynn says
Yes! I love that girl! <3
Amanda says
I have 8 oz all jars. Will that be okay?
Nancylynn says
I think so!
Shawn says
Wondering if these can be done in the microwave?
Nancylynn says
Sure!
Julia says
Have you ever made this in an instant pot? If so, what would you set it on and how long?
Nancylynn says
Yes! Five minutes on high pressure and a ten min natural release! I cook the bacon on saute first!
Kelli says
All in jars still or in the liner? Or a Pyrex?
Nancylynn says
In the jars
Karen says
Sounds yummy! Have you tried cooking these in an Instant Pot? If how long? Covered?
Erin says
Great thanks Nancy!! Making it now ?
Nancylynn says
Let me know what you think!!
Erin says
You Cook the turkey bacon first right?
Nancylynn says
yes!!
Jocelyn says
Sounds great! Do you think this would work with frozen cauliflower rice? If so, should I cook it first, or thaw it, or just keep it frozen? Thanks! Can’t wait to try this!
Nancylynn says
I would thaw it first, but you can keep it raw!
Kori says
Cauliflower rice?
Nancylynn says
Yup! It’s essentially just shredded cauliflower – you can buy it premade this way or just pulse your raw florets in a food processor!