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Home » Recipe Index » Ultimate Overnight Breakfast Casserole Easy Delicious Recipe
Overnight Breakfast Casserole

Ultimate Overnight Breakfast Casserole Easy Delicious Recipe

December 27, 2025 by Élodie Morel

 

There’s something undeniably special about waking up to the smell of a warm, hearty breakfast wafting through your home, isn’t there? I remember weekends at my grandmother’s house, where she would whip up a luscious breakfast casserole that brought everyone to the table with eager anticipation. Those mornings were filled with laughter, stories, and the comforting aroma of eggs, sausage, and gooey cheese mingling together. As seasons change and the crispness of fall gives way to the warmth of the holidays, I find myself yearning for that same cozy feeling. That’s why I’m excited to share my recipe for Overnight Breakfast Casserole with you! It’s easy, delicious, and perfect for those busy mornings when you want to savor a bit of home-cooked comfort.

Why You’ll Love This Recipe

  • Make-ahead convenience: Prepping it the night before saves you time in the morning.
  • Budget-friendly: Uses simple ingredients that won’t break the bank.
  • Customizable: Easily tweak it to fit your taste preferences.
  • Comforting flavors: A warm, cheesy hug on a plate.
  • Feeds a crowd: Perfect for brunches, gatherings, or a family breakfast.

Ingredients

Here’s what you’ll need to create this delightful Overnight Breakfast Casserole:

  • 8 slices of bread (I love using a hearty whole grain or sourdough for more flavor!)
  • 1 pound of breakfast sausage (you can go spicy or mild, your choice!)
  • 8 large eggs
  • 2 cups of milk (whole milk gives it creaminess, but feel free to use low-fat)
  • 1 teaspoon of Dijon mustard (adds a lovely depth of flavor)
  • 2 cups of shredded cheese (cheddar or a blend works best)
  • 1 cup of bell peppers, diced (any color will do, but red adds a nice pop!)
  • 1/2 cup of green onions, chopped (for that fresh touch)
  • Salt and pepper to taste

Step-by-Step Instructions

  1. Prepare the Bread: Cut the bread into cubes (about 1-inch pieces) and spread them evenly in a greased 9×13-inch baking dish. The bread is the foundation of your casserole, soaking up all those yummy flavors!
  2. Cook the Sausage: In a skillet over medium heat, cook the sausage until browned and crumbly, about 6-8 minutes. If you choose spicy sausage, keep a glass of water nearby; the flavors can sneak up on you! Drain excess grease and set it aside to cool slightly.
  3. Whisk the Eggs: In a large bowl, whisk together the eggs, milk, Dijon mustard, salt, and pepper. The mustard will give it a subtle zing, so don’t skip this step!
  4. Add the Veggies and Sausage: Gently fold in the cooked sausage, diced bell peppers, and most of the green onions (save some for garnish). You want to get everything nicely integrated here.
  5. Combine: Pour the egg mixture evenly over the bread cubes, making sure every piece is coated. Give it a little shake or use a spoon to poke down any floating bread. This step ensures that every bite is packed with flavor!
  6. Top with Cheese: Sprinkle the shredded cheese over the entire casserole. More cheese = more happiness, right?
  7. Cover and Chill: Cover the dish with plastic wrap and refrigerate overnight. This is where the magic happens! The bread soaks up all the eggy goodness.
  8. Bake: When you’re ready to eat, preheat your oven to 350°F (175°C). Bake uncovered for about 45-50 minutes, or until it’s puffed and golden brown. Your kitchen will smell like heaven!
  9. Let it Rest: Allow the casserole to set for about 10 minutes before slicing. Patience is a virtue, my friend!

Pro Tips & Variations

This casserole is wonderfully versatile! Here are some fun ways to make it your own:

  • Herbs and Spices: Add fresh thyme, rosemary, or a sprinkle of smoked paprika for an exciting twist.
  • Cheese Swap: Mix it up with mozzarella, pepper jack for some heat, or even feta for a Mediterranean flair.
  • Veggie Lovers: Toss in some spinach, mushrooms, or zucchini if you want to sneak in more veggies!
  • Dietary Swaps: Use egg substitutes for a vegetarian version or gluten-free bread for a gluten-sensitive treat.
  • Extra Crunch: Top it off with crushed tortilla chips or panko breadcrumbs mixed with olive oil before baking for an added crunch.

Serving Suggestions

When it comes to serving your Overnight Breakfast Casserole, I like to keep things cozy and relaxed. Picture this: a warm casserole nestled on the table, flanked by steaming cups of coffee and fresh orange juice. Slice up some fresh fruit or serve it alongside crispy hash browns for a complete breakfast experience. You can also offer a sprinkle of fresh herbs or a swirl of hot sauce on the side for those who like a little kick! The best part? This casserole is just as delightful on its own as it is when paired with a delicious next bite.

Storage Tips

Leftovers are another reason this casserole is a win. Store any extras in an airtight container in the refrigerator for up to 3 days. To reheat, simply pop it in the microwave or warm it up in the oven at 350°F (175°C) until heated through. If you want to freeze it for later, slice it into portions before wrapping each slice tightly in plastic wrap and placing them in a freezer bag. It will keep well for up to 2 months. Just thaw overnight in the refrigerator before reheating!

FAQs

Can I make this casserole vegetarian?

Absolutely! Just skip the sausage and load up on your favorite veggies. You can even add some plant-based sausage crumbles if you want that meaty texture without the meat!

Can I use frozen vegetables?

Yes! Frozen vegetables work wonderfully in this casserole. Just make sure to thaw and drain any excess water before mixing them in so your casserole doesn’t get soggy.

How do I know when it’s done baking?

You’ll know it’s done when the edges are nicely browned and the center is set. A knife inserted into the center should come out clean. Don’t forget to let it sit for about 10 minutes; this helps everything firm up a bit!

Can I use a different type of bread?

For sure! Feel free to experiment with brioche, challah, or whatever bread you have on hand. Just keep in mind that different breads may absorb the egg mixture differently.

Is it okay to prep it in the morning instead of overnight?

While overnight soaking is best for flavor and texture, you can put it together in the morning. Just let it sit for at least 30 minutes before baking to give the bread a chance to soak up some of the egg mixture.

Conclusion

I hope you enjoy making this Overnight Breakfast Casserole as much as I do! It’s a dish that brings back cherished memories while creating new ones around your table. Please let me know how it turns out for you—I’d love to hear about the variations you added or the special moments you shared while enjoying it. Don’t hesitate to drop a comment below! Happy cooking!

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Overnight Breakfast Casserole

Ultimate Overnight Breakfast Casserole Easy Delicious Recipe


  • Author: meryem
  • Total Time: 65 minutes
  • Yield: 8 servings 1x
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Description

Savor a hasslefree morning with this easy overnight casserole recipe Enjoy a delicious breakfast thats ready when you wake up Perfect for busy days


Ingredients

Scale
  • 8 slices of bread
  • 1 pound of breakfast sausage
  • 8 large eggs
  • 2 cups of milk
  • 1 teaspoon of Dijon mustard
  • 2 cups of shredded cheese
  • 1 cup of bell peppers, diced
  • 1/2 cup of green onions, chopped
  • Salt and pepper to taste

  • Instructions

  • Prepare the Bread: Cut the bread into cubes and spread them evenly in a greased 9×13-inch baking dish.
  • Cook the Sausage: In a skillet over medium heat, cook the sausage until browned and crumbly.
  • Whisk the Eggs: In a large bowl, whisk together the eggs, milk, Dijon mustard, salt, and pepper.
  • Add the Veggies and Sausage: Gently fold in the cooked sausage, diced bell peppers, and most of the green onions.
  • Combine: Pour the egg mixture evenly over the bread cubes, ensuring every piece is coated.
  • Top with Cheese: Sprinkle the shredded cheese over the entire casserole.
  • Cover and Chill: Cover the dish with plastic wrap and refrigerate overnight.
  • Bake: Preheat your oven to 350°F (175°C) and bake uncovered for about 45-50 minutes.
  • Let it Rest: Allow the casserole to set for about 10 minutes before slicing.
  • Notes

    A delightful Overnight Breakfast Casserole that’s easy to make, perfect for busy mornings, and brings home-cooked comfort to your breakfast table.

    • Prep Time: 15 minutes
    • Cook Time: 50 minutes
    • Category: Breakfast
    • Cuisine: American

    Nutrition

    • Serving Size: 8 servings
    • Calories: 350
    • Sugar: 3g
    • Fat: 25g
    • Carbohydrates: 30g
    • Fiber: 2g
    • Protein: 20g

    Keywords: breakfast casserole, overnight casserole, easy breakfast recipe

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