This easy Breakfast Casserole recipe is made with eggs, sausage, and cheese and only takes a few minutes to throw together. You can make it ahead of time, so it’s the perfect breakfast casserole for Christmas morning or any day!

Breakfast casserole baked in a 9x13'' white pan and cut into twelve servings.

Breakfast Casserole

So, I always thought I had the best breakfast casserole recipe (this overnight breakfast casserole that we make a few times a year).  I recently learned I was mistaken, because this breakfast casserole right here really is the BEST!

And, although I still really love the other recipe, this one is more of a traditional breakfast casserole, with tons of eggs, and it’s fantastic!  Plus, you can still make it the night before so it’s perfect for holidays and special events where you don’t have a lot of time to prepare in the morning.

I adapted this recipe from my sister Jessica over at Pretty Providence. I added a couple extra eggs, some milk, left out the mushrooms and cut the amount of bell peppers in half. The great thing about this recipe is how adaptable it is! It’s delicious with other types of cheese like pepperjack or Swiss, or you could try adding more veggies, like spinach or zucchini.

A slice of breakfast casserole on a white plate with a fork.

How to make easy breakfast casserole:

The main ingredients for this egg casserole are really simple and include: eggs, sausage, bell peppers, onion, and cheese. We add sour cream and milk to the egg mixture to make it creamy, light and fluffy.

An overhead photo of the ingredients for breakfast casserole including eggs, red and green bell pepper, green onion, sausage and shredded cheddar cheese.

To make the casserole combine the eggs, sour cream, milk, cheese, and salt and pepper in a large bowl.

Next, cook the sausage, breaking it into small bits as it’s browning.  Set it aside and then saute the bell peppers and onions in the same pan. Add everything to the egg mixture and stir to combine.  Pour it into a 9×13” pan and bake for 35-50 minutes or until the edges are set and the center is a little jiggly in the center. It will continue to cook and set up as it cools.

Overhead process photos of an egg breakfast casserole in a white dish unbaked and then baked.

After baking, leftover egg casserole can be stored in the fridge and enjoyed within 3-4 days. Leftovers are delicious reheated in the microwave.

Can I make this breakfast casserole ahead of time?

Yes, you can make this breakfast casserole a day ahead, or freeze it to bake another day!

To make one day ahead of time, prepare everything as directed, up until baking. Cover the casserole and store it (unbaked) in the refrigerator overnight or up to one day. Bake in the morning, according to recipe instructions.

To freeze breakfast casserole prepare the recipe and add to your pan. Cover well with plastic wrap and then tinfoil and freeze for 2-3 months. Allow it to thaw overnight in the refrigerator, and then let it come to room temperature before baking according to recipe instructions.

A spatula removing a slice of breakfast casserole from the pan.

Consider trying these popular brunch recipes:


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Breakfast casserole baked in a 9x13'' white pan and cut into twelve servings.
Prep 10 mins
Cook 55 mins
Total 1 hr 5 mins
Add to Meal Plan



  • 2 pounds pork sausage
  • 12 eggs
  • 1 cup sour cream (light or regular)
  • 1/4 cup milk
  • salt and pepper
  • 4 green onions
  • 1/2 green bell pepper , diced
  • 1/2 red bell pepper , diced
  • 2 cups shredded cheddar cheese


  • Preheat oven to 350 degrees. Spray a 9x13’’ pan with cooking spray.
  • Combine the eggs, sour cream, milk, cheese and salt and pepper in a large bowl. Mix on low speed with electric mixers, just until combined.
  • Heat a large skillet over medium heat. Add sausage and cook until browned, breaking it into small pieces with a wooden spoon as it cooks. Drain most of the grease and add the sausage to the bowl with the egg mixture.
  • Add the bell peppers and onion to the same skillet the sausage was cooked in and sauté for 2- 3 minutes. Add to the bowl with the eggs and stir everything to combine.
  • Pour mixture into greased 9x13’’ pan and bake for 35-50 minutes or until the edges are set and the center is just barely jiggly.
  • Leftover egg casserole can be stored in the fridge and enjoyed within 3-4 days. Leftovers are delicious reheated in the microwave. 


Adapted from Pretty Providence.
*Directions for freezing or making the casserole ahead of time are above in the post.


Calories: 385kcalCarbohydrates: 2gProtein: 23gFat: 30gSaturated Fat: 12gCholesterol: 239mgSodium: 669mgPotassium: 327mgSugar: 1gVitamin A: 705IUVitamin C: 11.6mgCalcium: 194mgIron: 1.8mg

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About The Author

Lauren Allen

Welcome! I’m Lauren, a mom of four and lover of good food. Here you’ll find easy recipes and weeknight meal ideas made with real ingredients, with step-by-step photos and videos.

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  1. 5 stars
    Wow, thanks for this. 🙂 This is already my third time making it. Making for dinner tonight and then using leftovers for breakfast burrito fillings! I cook the recipe exactly as written and my family of 5 (with three little kids) is super happy.

  2. 5 stars
    One day I’ll have sausage in my house and I can try the full recipe haha
    Made this twice now since I usually have all the other ingredients sitting around!
    Super yummy and I just cut up some cold cuts. Honey ham worked great 🙂
    Great for a quick breakfast during my busy week

  3. 5 stars
    I make this often and I use hash browns cookie sheet oiled seasoned baked @400/30mins and use them as bottom crust then add egg mix add peppers sausage and cheese bake an last 3-5mins add cheese of your choice all works well an cool eat or add to soft shells an go yummy

    1. I’m excited! I have diced honey ham, eggs and spinach wraps and or thin bagels. Wish I had mushrooms. Cooking is my new sanctuary. Think Feta or fresh mozzarella? I promise don’t let me go grocery shopping when I’m hungry!!! Lol

  4. Tres leches layer cake is delicious. I added additional confectionery sugar to make the whipped cream frosting sweeter. Family loved it!

  5. 5 stars
    This truly is the BEST breakfast casserole! We make with greek yogurt versus sour cream and it is so creamy, thank you so much for sharing!

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