Overnight Sausage Breakfast Casserole

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Sausage Breakfast Casserole is loaded with sausage, peppers, cheese and Italian seasoning is one my favorite make ahead  breakfasts! You’ll love this for holidays and when you’ve got guests as it can (and should) be made ahead of time!

Breakfast casserole is literally my favorite breakfast recipe of all time and everyone raves about it. Serve with a fresh fruit salad!

Sausage Breakfast Casserole in clear glass baking dish

A Favorite Breakfast Made Easy

My Mom has made bacon breakfast casserole on Christmas morning for as long as I can and either one is my absolute favorite holiday dish (along with a classic stuffing recipe of course).

I love that overnight casseroles (both in the oven and a Slow Cooker Breakfast Casserole) can be prepped the night before making it perfect for holidays, weekends and even for overnight guests.

How to Make a Sausage Breakfast Casserole

This sausage egg casserole is very simple to make!

  1. Place bread cubes, chopped peppers and cooked sausage in a casserole dish (per recipe below).
  2. Combine eggs, milk and cheese. Pour over bread.
  3. Refrigerate at least 4 hours (overnight is best).  This allows the bread cubes to soak up the egg mixture.
  4. In the morning just bake and serve!

This quick and easy casserole recipe can be made the night before for a worry-free weekend breakfast (or prep in the morning to bake for dinner after a long day).

Sausage Breakfast Casserole on a white plate


Variations on Sausage Breakfast Casserole

I love adding Italian sausage to this recipe along with fresh red and green peppers because the sausage has so much flavor!

  • Meat: Sausage is my first choice in this recipe, it has lots of flavor!
  • Vegetables: I use peppers and onions for flavor. Any veggie will do (including leftover roasted veggies). If your vegetables are watery (like mushrooms) be sure to pre-cook them so they don’t make the casserole watery. If you use veggies like asparagus or broccoli, steam until tender crisp.
  • Cheese: Use whatever you have on hand! Gruyere or a bit of swiss also add a great flavor.

Substituting Bread With Hashbrowns

While I much prefer the consistency of this dish using bread cubes, you can certainly make this into a sausage hashbrown casserole in place of bread. You can also use leftover rolls, hot dog buns… pretty much any dry bread will work!

If you’re lucky enough to have leftovers, this dish reheats really well and freezes perfectly.

More Easy Eggs

Sausage Breakfast Casserole in clear glass baking dish
4.83 from 23 votes
Review Recipe

Sausage Breakfast Casserole

Prep Time 15 minutes
Cook Time 1 hour 5 minutes
Total Time 1 hour 20 minutes
Servings 8 servings
Author Holly Nilsson
Overnight Sausage Breakfast Casserole with sausage, peppers, cheese and Italian seasoning is one my favorite make ahead breakfasts!


  • 14 slices bread crust removed, cubed and dried (see note)
  • 1 package Johnsonville Naturals Italian Sausage
  • 3 green onions sliced
  • ½ red bell pepper finely diced
  • ½ green bell pepper finely diced
  • 2 cups shredded Italian blend cheese
  • 2 cups mozzarella cheese
  • 6 eggs
  • 3 cups milk
  • 1 teaspoon Italian seasoning
  • pepper to taste

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  • Remove casing from sausage and cook over medium high heat until no pink remains. Drain any fat.
  • Layer ½ of the cubes in a greased 9×13 pan. Top with ½ of each the sausage, green onions, peppers, and cheese. Repeat layers ending with cheese.
  • Combine eggs, milk, & seasonings Pour egg mixture over bread ensuring all of the bread has been covered. Refrigerate overnight (or at least 3 hours).
  • Remove from fridge and place in the oven while preheating the oven to 350°F. Bake covered with foil 65-75 minutes or until a knife inserted in the center comes out clean. (If you are baking 2 pans increase cooking time will need to increase).

Recipe Notes

Allow bread to dry overnight or dry slightly in the oven at 300°F for about 10 minutes to dry slightly. (Do not brown or toast it).

Nutrition Information

Calories: 424, Carbohydrates: 31g, Protein: 30g, Fat: 19g, Saturated Fat: 9g, Cholesterol: 172mg, Sodium: 829mg, Potassium: 401mg, Fiber: 3g, Sugar: 8g, Vitamin A: 1075IU, Vitamin C: 16.6mg, Calcium: 682mg, Iron: 3mg

(Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.)

Keyword overnight breakfast casserole
Course Breakfast
Cuisine Italian
Sausage Breakfast Casserole in clear glass baking dish

This is a sponsored conversation written by me on behalf of Johnsonville. The opinions and text are all mine.

Overnight Sausage Breakfast Casserole with a title
Sausage Breakfast Casserole with a title
About the author


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Holly is a wine and cheese lover, recipe creator, shopping enthusiast and self appointed foodie. Her greatest passion is creating in the kitchen and making deliciously comforting recipes for the everyday home cook!

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Recipe Rating


  1. If I use hash browns instead of bread should I still refrigerate it overnight, or can it be cooked right away if making that swap?

  2. Hi Holly! Love your website and have enjoyed all your recipes so much. I’m making this one for tomorrow, Easter brunch. How many cups of dried bread should I end up with? I got a loaf of Italian from the bakery and it’s long and thinner on the ends. Should have bought a prepackaged loaf of bread that were uniform in size but I didn’t. Lol.

    1. I would estimate 1 cup per slice. If it’s a tiny bit more or less, the recipe will still be great. Enjoy Beth!

  3. What kind of bread do I use in this recipe? White or wheat? Regular sliced sandwich bread? What do you mean by “allow bread to dry overnight?” I will be trying this recipe just need some specific clarifications.

    1. Any of the above types of bread will work perfectly in this recipe. To dry overnight simply leave the bread on the counter uncovered. Enjoy!