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    The BEST Overnight Egg Casserole (Sausage, Egg, and Cheese)

    by Brendan Cunningham 4 Comments

    Jump to Recipe

    This overnight egg casserole is going to change the way you do breakfast. This recipe combines savory sausage with cheesy eggs and fluffy bread to make an addictive breakfast casserole everyone is sure to love. And best of all, everything comes together in just 10 minutes!

    A square serving of overnight egg and sausage casserole on a white plate with a fork and knife on the plate. There's a second serving of casserole in the background.

    Table of Contents

    • The Best Breakfast Casserole
      • Ingredients
        • Ingredient Substitutions and Suggestions
      • How To Make Overnight Egg Casserole
        • Step 1: Cook The Sausage
        • Step 2: Make The Egg Mixture
        • Step 3: Assemble The Casserole
        • Step 4: Bake The Casserole
      • How To Store Egg Casserole
        • How To Reheat Egg Casserole
      • FAQs About This Breakfast Casserole Recipe
        • Why do you refrigerate egg casserole overnight?
        • How long can you refrigerate an egg casserole before baking?
        • Can egg casserole sit out overnight?
      • Wrapping It Up
    • More Casserole Recipes
    • The BEST Overnight Egg Casserole (Sausage, Egg, and Cheese)
      • Ingredients
      • Instructions
      • Nutrition
      • Did you make this recipe?

    The Best Breakfast Casserole

    When it comes to breakfast casseroles, it doesn't get much better than this make-ahead egg bake. It has the perfect combination of flavors and it's made with simple breakfast ingredients like eggs, cheddar cheese, sausage, and bread.

    The end result is a savory, cheesy, hearty egg breakfast casserole your family won't be able to get enough of! Atleast mine can't. Plus, it's endlessly customizable, too, so you can make this casserole again and again without ever getting bored.

    The results are seriously out-of-this-world delicious for how easy this recipe is. In fact, everything comes together the night before, so all you have to do is grab it out of the fridge and pop it in the oven for the perfect make-ahead breakfast.

    By the way, since the oven does most of the heavy lifting, you'll have plenty of time to work on some breakfast sides like this million dollar bacon and these air fryer hash browns.

    A square serving of overnight egg and sausage casserole on a white plate with a fork and knife on the plate. There's a second serving of casserole in the background.

    Ingredients

    As I mentioned earlier, the ingredient list for this overnight egg casserole is really simple. In fact, if you love breakfast as much as I do, then I'm willing to bet you already have most - if not all - of the ingredients you'll need for it on hand already!

    Anyway, here's what you'll need:

    • 1lb. mild sausage, removed from the casing
    • 6 medium eggs
    • 2 cups milk
    • Salt and pepper, to taste
    • 1 tsp whole-grain mustard
    • 1 cup cheddar cheese, shredded
    • 6 slices of bread, cubed

    Pretty simple stuff, right?

    Oh, and you can use basically all of these same ingredients to make this Christmas breakfast casserole as well. So if you're craving more easy breakfast casseroles, definitely check that one out next!

    An assortment of ingredients including six eggs, a bowl of shredded cheese, a bowl of bread cubes, a plate of raw sausage, a container of milk, and a bowl of spices.

    Ingredient Substitutions and Suggestions

    When I make this recipe, I always use the ingredients listed above since I just think it tastes best that way. However, you definitely can make some adjustments to it if you'd like to put your own spin on it.

    First, this recipe calls for breakfast sausage, but if you want to make it more savory, you can use pork sausage, Italian sausage, or herbed chicken sausage. Just make sure you remove the casing if it has one.

    Now, this recipe is kept pretty simple, but if you want to add even more flavor to it, then you can play around with adding some extra ingredients. Things like diced red bell pepper, sliced mushrooms, green onions, crispy bacon, hash browns, and extra cheese can all boost the flavor in this casserole.

    A grey skillet with a wooden handle filled with cooked and broken up sausage.

    How To Make Overnight Egg Casserole

    Now it's time for the fun part - it's time to make the casserole!

    As I mentioned a few times, it's couldn't be easier to make this overnight egg casserole. And as the name suggests, this recipe requires you to make the egg casserole ahead of time and let it refrigerate overnight, so keep that in mind before making it.

    Anyway, let's not waste any more time and get cooking.

    A clear bowl with a beaten egg mixture in it.

    Step 1: Cook The Sausage

    First, you'll want to coat a 9-inch casserole dish with some butter or nonstick cooking spray.

    Then, you can take out a large skillet and set it over medium-high heat. Once the pan is hot, add the pork sausage and cook it for a few minutes, breaking it apart until it's browned and fully cooked.

    A clear bowl with a beaten egg mixture and a pile of shredded cheese in it.

    Step 2: Make The Egg Mixture

    Up next, grab a large bowl and whisk together the eggs with milk, salt, pepper, and whole-grain mustard. As soon as everything is fully mixed together, you can stir in the shredded cheddar cheese.

    A square baking dish filled with cooked sausage and bread crubes.

    Step 3: Assemble The Casserole

    Now that the filling is good to go, it's time to assemble the casserole. First, you'll want to place the cubed bread into the prepared baking dish, then add the browned sausage and pour the egg mixture on top.

    Then, you can transfer the prepared breakfast casserole into the fridge and let it chill overnight. 

    A square baking dish filled with cooked sausage, bread cubes, an egg mixture, and a layer of shredded cheese covering the dish.

    Step 4: Bake The Casserole

    The next day whenever you're ready to eat this delicious casserole, you'll want to preheat the oven to 350°F (180°C). Then, you can take the casserole out of the fridge while the oven preheats.

    Once the oven is heated, you can put the casserole in it and let it bake for about 45 minutes. When the time is up, allow the finished casserole to cool for 5 minutes before slicing and serving.

    Enjoy!

    A square serving of overnight egg and sausage casserole on a white plate with a fork and knife on the plate. There's a second serving of casserole in the background.

    How To Store Egg Casserole

    This recipe for overnight egg casserole makes 6 servings, but honestly, it's so good that I wouldn't expect to end up with any leftovers. In fact, I usually make two of these casseroles since everyone always wants two or three servings!

    Now, if you end up with leftovers, you can store them in an airtight container or just put the lid on your casserole dish if you have one. Stored this way, you can keep the baked casserole in the fridge for 3-4 days.

    Alternatively, if you want your leftovers to last even longer, you can store them in a freezer-safe bag and freeze the breakfast casserole for up to 2 months.

    A square serving of overnight egg and sausage casserole on a white plate with a fork on the plate. There's a second serving of casserole in the background.

    How To Reheat Egg Casserole

    When you're ready to enjoy your breakfast casserole again, it's definitely best reheated.

    To reheat your casserole, I suggest transferring it back to the casserole dish and heating it in the oven at 350°F for about 10 minutes or until the cheese melts and it reaches your desired temperature.

    However, if you're just trying to reheat a single serving, you can just pop it in the microwave and heat it in 30-second intervals until it's fully reheated.

    A square serving of overnight egg and sausage casserole on a white plate with a fork and knife on the plate. There's a second serving of casserole in the background.

    FAQs About This Breakfast Casserole Recipe

    Why do you refrigerate egg casserole overnight?

    You refrigerate the egg casserole overnight so the bread can soak up some of the egg mixtures. It allows the bread to stay tender instead of crisping up too much when it bakes the next day. 

    How long can you refrigerate an egg casserole before baking?

    You can refrigerate your egg casserole for up to 24 hours before baking. The least amount of time I'd suggest refrigerating it is for 1 hour. So if you want to make this casserole as soon as possible, you can bake it the same day you prepare it.

    Can egg casserole sit out overnight?

    No, you do not want to let egg casserole sit out overnight. Since it has uncooked meat in it, you'll want to make sure that you refrigerate it overnight.

    A square serving of overnight egg and sausage casserole on a white plate with a fork and knife on the plate. There's a second serving of casserole in the background.

    Wrapping It Up

    Well, that's how to make overnight egg casserole!

    This easy egg bake is about as quick, easy, and convenient as making breakfast for a big group gets. Plus, it's always a huge hit too.

    Anyway, I hope you love this breakfast casserole recipe as much as I/we do.

    As always, if you give this recipe a try, let us know how it goes in the comments below.

    More Casserole Recipes

    If you liked this easy breakfast casserole recipe, we have plenty more casseroles on the blog for you to try next!

    Check these out:

    • Cracker Barrel hashbrown casserole
    • Loaded cauliflower casserole
    • Mexican casserole
    • Chicken divan
    • Cheeseburger casserole

    Oh, and make sure to follow us on TikTok, Instagram, and YouTube! We post new recipes on them every day.

    Print

    The BEST Overnight Egg Casserole (Sausage, Egg, and Cheese)

    A square serving of overnight egg and sausage casserole on a white plate with a fork on the plate. There's a second serving of casserole in the background.
    Print Recipe

    ★★★★★

    5 from 4 reviews

    This overnight egg casserole is going to change the way you do breakfast. This recipe combines savory sausage with cheesy eggs and fluffy bread to make an addictive breakfast casserole everyone is sure to love. And best of all, everything comes together in just 10 minutes!

    • Author: Brendan Cunningham
    • Prep Time: 10 minutes
    • Cook Time: 45 minutes
    • Total Time: 55 minutes
    • Yield: 6 servings 1x
    • Category: Breakfast
    • Method: Oven
    • Cuisine: Casserole

    Ingredients

    Scale

    1lb. mild sausage, removed from the casing

    6 medium eggs

    2 cups milk

    Salt and pepper, to taste

    1 tsp whole-grain mustard

    1 cup cheddar cheese, shredded

    6 slices of bread, cubed

    Instructions

    1. Coat a 9-inch baking dish with some butter or oil.
    2. Heat a large skillet over medium-high heat. 
    3. Add the pork sausage and cook, breaking it apart, until browned.
    4. In a large bowl, whisk eggs with milk, salt, pepper, and whole-grain mustard. Stir in the cheddar cheese. 
    5. Place the bread cubes into the baking dish. Add the browned sausage and pour over the egg mixture. 
    6. Refrigerate the casserole overnight. 
    7. When ready to bake, preheat the oven to 350°F. 
    8. Bake the casserole for 45 minutes. Let the casserole cool for 5 minutes before slicing and serving.

    Nutrition

    • Serving Size: 1 serving
    • Calories: 294
    • Fat: 14
    • Carbohydrates: 23
    • Protein: 16

    Keywords: overnight egg casserole, overnight breakfast casserole, breakfast casserole, overnight egg casserole recipe, overnight breakfast casserole recipe, breakfast casserole recipe, easy breakfast casserole, egg breakfast casserole, egg breakfast casserole recipe, egg casserole ahead, easy egg bake, easy egg bake recipe, overnight egg casserole with bread, overnight egg casserole recipe with sausage

    Did you make this recipe?

    Share a photo and tag us @ImHungryForThat — we can't wait to see what you've made!

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    Reader Interactions

    Comments

    1. Paris

      March 11, 2023 at 11:23 pm

      Made this for breakfast today 5/5

      ★★★★★

      Reply
    2. Matt

      March 13, 2023 at 10:04 am

      Everything about this was awesome

      ★★★★★

      Reply
    3. Tammy

      March 14, 2023 at 6:12 pm

      I made this bacon instead cause I don't like sausage and it was phenomenal.

      ★★★★★

      Reply
    4. Kayla Smart

      March 20, 2023 at 8:15 pm

      Very easy whip up the night before. I popped it in the oven Sunday morning for a family dinner and my family loved it!

      ★★★★★

      Reply

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