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California Breakfast Casserole is loaded with sausage, avocados, and tomatoes. All your favorite California omelet flavors in one hearty casserole, perfect for sharing!
Featured with this Recipe
This California Breakfast casserole layers all the yummy goodness of a California style omelet in a family baked style. It’s one of my favorite breakfast dishes, especially when we have a crowd over for breakfast. I love making this on a warm summer morning and serving out on the patio, but it’s just as scrumptious on Christmas morning! Fresh and light, this breakfast casserole comes together in just minutes. It’s the perfect recipe to together the night before, store overnight in the fridge, then bake it in the morning. And it’s ideal for company, because it makes 12 generous servings. Serve with a side of fruit or toast and you have a healthy, hearty breakfast that everyone will love!
Ingredients in California Breakfast Casserole
- Frozen Sausage Patties
- Tomatoes
- Avocados
- Eggs
- Whole Milk
- Frozen Hash Browns
- Cheddar Cheese
- Salt and Pepper
- Optional Add-Ins: red bell pepper, spinach, bacon pieces, diced ham, mushrooms, or onions. If you add bacon, cook it first in a large skillet.
Tips for Making California Breakfast Casserole
- Layering the right way will ensure the breakfast casserole bakes evenly and sets up perfectly. Start with an even layer of breakfast sausage patties at the bottom of the baking dish, and top that with tomatoes and avocados, and then pour egg mixture on top, and top off with melted cheddar cheese.
- We like to smother our slices of breakfast casserole with sour cream and salsa or diced tomatoes.
- If you are weirded out by the avocado being cooked– don’t! It tastes great! However, if you must leave it out of the casserole and just want to use it as a garnish, that is a tasty option too.
- Using a cup of milk in the recipe makes the egg and hash brown mixture more light and fluffy. But we have made it without and it has turned out fine.
- If your casserole is still runny after baking, it most likely means the hash browns weren’t thawed enough before cooking. If you make the mix the night before you can definitely use frozen hash browns, they will thaw out in the fridge overnight. But if you’re preparing it the day of, make sure to thaw your hash browns before assembling the casserole.
Frequently Asked Questions
If you want to make this casserole up ahead of time, then add everything to a baking dish and wrap in saran wrap. Store in the fridge for up to 24 hours until baking. If you do this method, then you do not have to thaw the hash browns.
Breakfast casserole is a great dish on its own, but if we want a breakfast spread then we serve it with fruit and breakfast pastries.
This California Breakfast Casserole is done when the top is set and slightly golden brown.
READ NEXT: 33+ Breakfast Ideas
More Delicious Breakfast Dishes
Sweet or savory, breakfast recipes are some of our very favorites! If you love this California Breakfast Casserole, then try our Slow Cooker Breakfast Casserole and traditional Breakfast Casserole for savory options. But if you are in the mood for something sweet that will feed a group for breakfast you should try our Strawberry and Cream Cheese French Toast or Caramel Apple French Toast! During the fall one of my favorites is our Pumpkin Chocolate Chip Coffee Cake, and if I have company over Christmas I like to make a batch of our Eggnog French Toast with Gingerbread Syrup.
How to Make California Breakfast Casserole
California Breakfast Casserole
Video
Ingredients
Instructions
- Line the bottom of a greased 9×13 pan with sausage.
- Layer tomatoes and avocado slices over sausage.
- In a bowl, beat eggs and milk.
- Stir in all other ingredients.
- Pour hash and egg mixture over the sausage, tomatoes, and avocados.
- Bake at 350 for 45 min or until well set.
- Top with extra cheddar right after pulling out of the oven so it melts all over the top.
- Serve with salsa, diced tomatoes, and sour cream.
Notes
- Layering the right way will ensure the breakfast casserole bakes evenly and sets up perfectly. Start with an even layer of breakfast sausage patties at the bottom of the baking dish, and top that with tomatoes and avocados, and then pour egg mixture on top, and top off with melted cheddar cheese.
- We like to smother our slices of breakfast casserole with sour cream and salsa or diced tomatoes.
- If you are weirded out by the avocado being cooked– don’t! It tastes great! However, if you must leave it out of the casserole and just want to use it as a garnish, that is a tasty option too.
- Using a cup of milk in the recipe makes the egg and hash brown mixture more light and fluffy. But we have made it without and it has turned out fine.
- If your casserole is still runny after baking, it most likely means the hash browns weren’t thawed enough before cooking. If you make the mix the night before you can definitely use frozen hash browns, they will thaw out in the fridge overnight. But if you’re preparing it the day of, make sure to thaw your hash browns before assembling the casserole.
oh man… I totally didn’t thaw the hashbrowns :(. It’s so watery! ahhhhh
Shoot, hopefully they still ended up ok!
I made this this weekend and it turned out fantastic and was a huge hit. After reading some of the comments where there were problems I thought I would share a couple of suggestions. I used a bag of Simply Potatoes Hashbrown, you don’t have to thaw them so no extra moisture like you might get from the frozen kind. Make sure you seed the tomatoes, again eliminating extra juice and finally extra large eggs. Mine baked to perfection in one hour. Definitely recommend this recipe and there are so many possibilities to tweak it to fit your personal preference. Hope this helps.
My daughter fixed this last week and everyone loved it. My husband prefers this recipe to the ones that have english muffins or bread. I made it for our pot luck at Palm Sunday, and will make it again on Easter. Very good!
I made this today for our Sunday School class. It was a HUGE hit! It turned out perfect and bursting with flavor! Love how colorful it is! I did take your advice and cook it in a ceramic dish. I also added 20 minutes to the cooking time. I am mixing up another as we speak to take to work tomorrow!
So glad you liked it! What a lucky Sunday School class! 😀
Any thoughts about substituting vegetarian mock meat??
hmmm.. not familiar with “mock meat”…. if you try it let us know how it turns out!
The picture makes it look like there is a layer under the sausage. Is there on or is this the milk and other ingredients settling?
The egg seeps under the sausage and makes it seem like there is another layer– but there isn’t. Hope this helps!
Do u cook the sausage first?
Yes, I like to cook and part off the excess grease before adding it to the casserole.
This looks great, but I have one question; what’s under the sausage?
Thanks for asking, Christian. When you pour on the egg/milk/hash brown mixture it surrounds the sausage and cooks on the bottom of the pan.
I have made a recipe very similar to this one and I did not use the cup of milk, only the eggs without the milk and it was not liquidy after cooking it for the suggested time or a just a bit longer seeing I don’t like runny eggs. no need to have milk or any liquid in there. Recipe here is a real good one. thanks
Thank you for the suggestion!
I first had this at a baby shower & it was great! However, it took TWO hours to cook in a 9×13 metal pan when I baked it for a potluck today! Luckily I allowed extra time or I’d have gone dishless! Hoping the tomatoes & avocados held up!
Something is not right. That photo looks like it has a crust of some kind under the sausage. And it’s not cooked eggs. You can tell from the photo the crust is separate and distinct from the sausage layer.
It looks like there is a crust but there is not. It is egg that has seeped beneath the sausage layer. This is the same recipe as the one pictured. Hope this helps!
A few adjustments are needed here in my opinion. First of all, adding an entire cup of milk is far too much. It causes the dish to have excess liquid which can make for an unpleasant texture. It makes it seem as if the eggs are still raw. Also I made a base layer of crushed up tortilla chips, using just sausage is a bit awkward when trying to plate. And speaking of sausage, precooked sausage isn’t the best for you. So I opted to use shredded chicken breast! It makes the dish heartier and not as fatty! As for produce, I used Roma tomatoes (for their AMAZING flavour), added white onions, red bell peppers, and jalapeños on one half. My hubby can’t get enough of those! All in all, good idea for a dish. Just needed some tweaking to make it truly fantastic!
Maybe you should share your own recipes on your own blog? Yours sounds very good but so does the one Emily shared with us on her blog. 🙂
Agree! I do not care for chicken so that would not be a “truly fantastic” dish for me. I cannot wait to try this recipe , sausage, milk and all!
Are you suppose to cover while you bake this dish?
You don’t need to cover it but if you do it couldn’t hurt!
will have to try sounds yummy thank you
My first granddaughters name is ” Echo Dawn”
What a great name! We have 4 “Echo’s” in our family. 🙂
One question ? The recipe start with sausage on the bottom and the picture is displaying a layer of something before the sausage is laid. What is the layer before the sausage. t Than
The sausage does get put down first. Some of the egg mix just seeps down making it look like an added layer.
I finally made this dish and it was DELICIOUS. I added a twist to it, I added spinach and I used Italian sausage and chorizo. I excluded the guacamole in the mixture but did add to the final product along with jalapeños, salsa and sour cream. Thanks for sharing
I am getting ready to make this, this morning for Thanksgiving! Thank you for the recipe, hope it turns out as good as yours looks! 🙂
What is on the bottom of the casserole?
Some of the egg and hash brown mixture settles on the bottom with the sausage as it bakes. Thanks for asking!
Thanks for sharing it looks so good!!!!
I made this for friends this week when we were away on vacation and it was a hit. I made it in a glass 9×13 pan and it took an hour to cook. When I got home my husband was jealous that I made it for friends so I made it for us at home again today. He LOVED it. Keeper recipe, thank you! I’m glad to see in the comments here that it can be assembled the night before. Looking forward to hearing if anyone freezes it.
So glad to hear you liked it! We have assembled it the night before as well and it is great– just haven’t done the freezing thing. Let us know if you try it and how it turns out!