Easy Overnight Italian Breakfast Casserole - Baker by Nature (2024)

by Ashley Manila 15 Comments

This Quick and Easy Overnight Italian Breakfast Casserole is perfect for weekend brunch, Christmas morning, or breakfast for dinner! Made with lots of veggies and Italian sausage, it’s so flavorful and delicious! Serve warm or cold!

Easy Overnight Italian Breakfast Casserole - Baker by Nature (1)

Breakfast Casserole

Good morning! I hope you’re ready for breakfast. Because today we’re diving into the tastiest brunch casserole you’ll ever make! My family literally BEGS me to make this every weekend. And I happily comply because it couldn’t be easier!!! And it serves a crowd. Which means with our smaller household, we always have leftovers. And you know I LOVE leftovers.

Now, I know egg casserole isn’t the sexiest sounding recipe. But I pinky swear that if you give this humble casserole dish a try, you won’t regret it. So preheat your oven to 350 and let’s chat ingredients, ok?!

Easy Overnight Italian Breakfast Casserole - Baker by Nature (2)Easy Breakfast Casserole

This easy overnight Italian breakfast casserole is infinitely adaptable! Below you’ll find the ingredients I like to use, along with plenty of substitution ideas!

  • Eggs (I suggest using the best quality eggs you can find! We love pasture raised eggs from the farmers market)
  • Milk (use whole milk or, for a richer casserole dish, use heavy cream)
  • Parmesan cheese (can easily be substituted with pepper jack, sharp cheddar, or any variety of cheese that tickles your fancy!)
  • Salt and Pepper
  • Olive Oil (If you’re in a pinch, use butter or refined coconut oil)
  • Spinach (sub with kale or even swiss chard!)
  • Red Bell Peppers (any color pepper will work!)
  • Onion (we used a combination of red onion and yellow onion. even green onions could work!)
  • Italian Sausage (hot Italian sausage or sweet Italian sausage work great! to make this a meat-free dish, simply omit the sausage. not a fan of sausage? use bacon instead!)

Easy Overnight Italian Breakfast Casserole - Baker by Nature (3)

As you can see from the ingredient list above, I did not use bread cubes for this recipe. I know a lot of recipes do, but I find it completely unnecessary. But if you’re looking to serve a carb with this breakfast casserole, it goes great with my white cheddar, bacon, and apple biscuits!

Easy Overnight Italian Breakfast Casserole - Baker by Nature (4)

How to make Breakfast Casserole

  • Place a large skillet over medium heat and coat it withnonstick cooking spray or a little bit of olive oil. Add the sausage to the skillet and begin to break it up into small chunks. Cook sausage until it’s golden brown and no longer pink then drain any grease from the pan. Remove sausage from the pan and set aside until needed.
  • In the same pan, add in the peppers, spinach, onion, garlic, rosemary, Italian seasoning, salt and pepper. Add a little extra olive oil if needed. Cook until veggies down until they’re tender. Toss the sausage back in the pan, and remove the pan from heat.

Easy Overnight Italian Breakfast Casserole - Baker by Nature (5)

  • In a large bowl combine the eggs, milk, cheese, salt, and pepper. Whisk until well combined. Set aside.
  • Generously grease a 9×13 baking dish. Add half of the veggie and sausage mixture to the bottom of the pan.

Easy Overnight Italian Breakfast Casserole - Baker by Nature (6)

  • Then pour the egg mixture on top. Add remaining veggies and sausage and shake the pan gently. Cover casserole with saran wrap or aluminum foiland refrigerate overnight! If you don’t want to make this an overnight recipe, simply bake right away!

Easy Overnight Italian Breakfast Casserole - Baker by Nature (7)

  • Bake the casserole until the top is golden brown and a knife inserted in the center comes out clean. Usually about 50 minutes!!!

Easy Overnight Italian Breakfast Casserole - Baker by Nature (8)

How long does Breakfast Casserole last?!

If you’re a smaller household, don’t fret about this going to waste! Because leftovers keep well, storedin the refrigerator, for up to 5 days. You can reheat it in the microwave or oven, or simple eat it cold. Personally, I love making this breakfast casserole on a Sunday night and enjoying a piece for lunch throughout the week. Sometimes I heat it up… but usually I just eat it cold, with lots of hot sauce on top.

More Breakfast Recipes:

  • Eggs in Purgatory
  • Mushroom, Bacon, and Swiss Frittata
  • Overnight Raspberry French Toast Casserole
  • Croque Madame McMuffins
  • Eggs Benedict
  • Quiche Lorraine

Overnight Italian Breakfast Casserole

Ashley Manila

This Quick and Easy Overnight Italian Breakfast Casserole is perfect for weekend brunch, Christmas morning, or breakfast for dinner! Made with lots of veggies and Italian sausage, it's so flavorful and delicious! Serve warm or cold!

4.67 from 6 votes

PRINT RECIPE PIN RECIPE

Prep Time 15 minutes mins

Cook Time 55 minutes mins

Total Time 1 hour hr 10 minutes mins

Course Breakfast

Cuisine Italian

Ingredients

  • 1 Tablespoon olive oil or cooking spray
  • 1 pound uncooked Italian sausage, casings removed
  • 1 teaspoon Italian seasoning
  • 1 teaspoon fresh rosemary, finely chopped
  • 1 small onion, diced
  • 2 red bell peppers, seeds removed, diced
  • 2 cups fresh spinach
  • 2 cloves garlic, minced
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1 dozen large eggs
  • 1/2 cup full-fat milk
  • 1/3 cup ricotta cheese
  • 1/3 cup finely grated Parmesan cheese

Instructions

  • Generously grease a 9×13 casserole dish. Set aside until needed.

  • Place a large skillet over medium heat. Add a Tablespoon of olive oil or spray with nonstick cooking spray. Add the sausage to the skillet and, using a spatula, break the sausage up into small chunks. Add in the Italian seasoning and rosemary and continue cooking until the sausage is golden brown and no pink remains. Using a slotted spoon, transfer the sausage to a clean plate and set aside. Discard of remaining grease and return the pan to the burner.

  • Add a little more olive oil to the pan. Then add the onions and peppers and cook until they begin to soften, about 6 minutes. Stir in the spinach, garlic, salt, and pepper and continue cooking for another 2 minutes. Add in the sausage and stir to combine. Remove pan from heat and set aside until needed.

  • In a large mixing bowl, whisk together the eggs, milk, ricotta, and Parmesan cheese.

  • Spread half of the sausage and veggie mixture in the bottom of the prepared casserole dish. Top with the egg mixture, then top with the remaining sausage and veggies. Shake the pan lightly back and forth to gently mix the ingredients.

  • Cover casserole and refrigerate overnight, or place the baking dish in the oven and bake at once.

When ready to bake

  • Preheat the oven to 35o degreed (F). Bake the casserole, uncovered, for about 55 minutes. Or until it's set in the middle and golden brown. Cool for 10 minutes before slicing and serving.

  • Leftovers will keep, wrapped tightly and stored in the refrigerator, for up to 5 days.

Tried it and loved it?Snap a picture and share it with me on Instagram @Bakerbynature and by using the hashtag #BakerByNature

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  1. Easy Overnight Italian Breakfast Casserole - Baker by Nature (16)Kim says

    Do you have the nutritional facts for this recipe? I made it and it is delicious.

    Reply

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Easy Overnight Italian Breakfast Casserole - Baker by Nature (2024)

FAQs

Why do you have to refrigerate breakfast casserole overnight? ›

Success Tip: Refrigerate Overnight

During this time, the flavors mingle together and the bread has a chance to soak up some of the liquid and flavor. Wake up and all you have to do is slide it into the oven. If you're in a rush, I do recommend at least 30 minutes in the refrigerator before baking, if you can spare it!

Why is my breakfast casserole soggy? ›

Baked egg dishes tend to have issues with becoming too rubbery or watery after cooking. This is especially the case when high-moisture vegetables or dense meats are in the mixture—sautéing the potatoes and vegetables before baking helps to dry the food and concentrate flavors.

Can you leave raw egg mixture in the fridge overnight? ›

If you've got raw egg yolks or whites left over from a recipe which you don't want to waste (let's face it, why would you?), you can store them in the fridge as long as you plan to use them within the next few days.

What happens if you forget to put casserole in the fridge overnight? ›

Myth: You shouldn't put hot foods in the refrigerator.

Perishable foods should be put in a refrigerator that is 40 degrees or below within 2 hours of preparation. If you leave food out to cool and forget about it after 2 hours, throw it away.

What is the most common Italian breakfast? ›

The most common classic breakfast food in Italy is the “cornetto”, or croissant. A cornetto is often filled with some kind of cream, custard, jam or chocolate spread, and accompanied by a coffee.

What pastries do Italians eat for breakfast? ›

Here are some well-known Italian breakfast pastries that people interested in the baking and pastry arts can recreate in their own kitchens:
  • Cornetti. While the French have croissants, Italians have cornetti. ...
  • Biscotti. ...
  • Panino. ...
  • Fette biscottate. ...
  • Coffee pairings.
May 18, 2017

Can you eat an egg casserole that was left out overnight? ›

Follow these serving guidelines for eggs and egg dishes.

Never leave cooked eggs or egg dishes out of the refrigerator for more than 2 hours or for more than 1 hour when temperatures are above 90° F. Bacteria that can cause illness grow quickly at warm temperatures (between 40° F and 140° F).

Why do casseroles have to sit overnight? ›

Not letting baked casseroles rest before serving.

Just like you rest your meats after cooking to allow the juices to reabsorb, a casserole right out of the oven has all of its liquid bubbling at the surface and ready to flow like lava.

Can you leave sausage casserole out overnight? ›

The general rule is to follow the two-hour rule. This means cooked sausages are safe to eat for up to two hours after cooking, as long as the room temperature stays below 90°F (32°C). If the temperature is above 90°F, then it's best to refrigerate them within one hour of cooking.

How long does it take for a refrigerated casserole to come to room temperature? ›

How long does it take a refrigerated casserole to come to room temp? Depending on the size of the dish and the density of its contents, it takes about an hour for to come up to room temperature. Add more time for a larger pan or one with dense contents.

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