Overnight Everything Bagel Breakfast Casserole Recipe

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Are you looking for a savory breakfast dish that’s easy to make and bursting with flavor? Look no further than this Everything Bagel Casserole recipe! Made with stale bagels, eggs, cheese, and your favorite bagel seasoning, this dish is sure to become a new favorite in your breakfast lineup.

Even better, you can meal prep this bagel egg casserole the night before and enjoy this yummy brunch recipe in the morning!

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Easy and Delicious Everything Bagel Casserole Recipe for a Savory Breakfast

We are a quiche family.

I grew up eating quiche on Christmas morning and continued the tradition with my own family.

But I expanded the tradition to include Easter, Mother’s Day, or even the first day of school.

We just love quiche!

But my tried and true quiche recipe might have met its match in this everything bagel cream cheese breakfast bake!

Sausage, eggs, cheese, and all those yummy seasonings that dust the top of my favorite everything bagel in a prepare-the-night-before casserole! 

Move over, quiche! There is a new ultimate breakfast that is a huge hit in our household!

Bagel Casserole Ingredients

There’s something special about starting the day with a hearty and flavorful meal that sets the tone for what’s to come. 

This savory breakfast casserole combines the beloved taste of everything bagels with multiple cheeses, savory sausage, and all sorts of seasonings that enhance the flavors. All this goodness creates a dish that’s as comforting as it is satisfying!

Don’t let the long list of ingredients overwhelm you. Just get everything chopped and prepped and then you will fly through the preparation.

I believe that organizing all of the ingredients ahead of time helps with quickly and easily assembling this casserole. Here is what you need:

• 1 lb. uncooked breakfast sausage or 1 lb. crispy bacon or turkey bacon
• 3 Tbs. unsalted butter
• 1 onion, thinly sliced
• 1 (10 oz.) package frozen spinach, thawed and squeezed dry
• 3 day-old everything bagels, halved and cut into bite-size pieces ( about 1-inch cubes). It is better if the bagels are day-old rather than fresh bagels.)
• 2 large tomatoes, chopped
• 1/4 cup fresh rosemary
• 1 cup Parmesan cheese, finely grated
• 1 1/2 cups Swiss or Gruyere cheese, grated and divided
• 1 1/2 cup Cheddar cheese, grated and divided
• 2 tsp. kosher salt, divided
• 1 tsp. black pepper, divided
• Everything but the Bagel Seasoning (Find this at Trader Joe’s.)
• 8 large eggs
• 2 cups milk
• 1 cup half and half
• 2 Tbsp. Dijon mustard (I like to use Trader Joe’s whole-grain Dijon mustard.)
• 1/4 tsp. cayenne pepper (I don’t like “heat” but this is just enough kick!)
• 8 oz. cream cheese, cut into small chunks

Assembling the Everything Bagel Casserole

First, you will cook the breakfast sausage in a large skillet and then cut it into bite-size pieces, you will sautee the onion slices in 2 Tbsp. butter on medium-low heat until translucent. 

In a large bowl, you will combine the cooked sausage, onion, thawed spinach, bagel pieces, tomatoes, rosemary, Parmesan cheese,  1 cup Swiss, 1 cup Cheddar, and 1 tsp. salt, `1/2 tsp. black pepper and a few shakes of Trader Joe’s Everything But the Bagel Seasoning.

Then, dig in with your hands and start to combine it together. Yes, you can use a spoon. But honestly, I think the ingredients incorporate better when mixed with your hands.

Plus it is fun!

Next, in a separate bowl, you will whisk the eggs, milk, half and half, mustard, and cayenne pepper together.

At this point, you have your bagel mixture and you have your egg mixture.

Place the bagel mixture into a buttered 9 x 13 casserole dish and press it in an even layer.

Next, pour the egg mixture over the top of the bagel mixture. With your fingers, press down on any bagel chunks on top so they become saturated with the egg mixture.

Some say “Cherry on Top?” I say “Cream Cheese on Top!” Take the chunks of cream cheese and nestle them evenly into the top of the casserole. Don’t worry. It is ok that the cream cheese chunks peek out over the top of the other ingredients!

Last, cover the baking pan with aluminum foil and place in the refrigerator for at least 2 hours and up to 12 hours. 

I shoot for 12 hours in the fridge for two reasons:

The longer the casserole is in the refrigerator, the more moisture the bagel chunks absorb.

I can go to bed and wake up to a fully prepped breakfast!

Wake up and Bake

Remove the aluminum foil and sprinkle the remaining Swiss and Cheddar cheeses over the casserole. Place the casserole in a 400-degree preheated oven for 15 minutes.

After 15 minutes, lower the oven temperature to 350 degrees. Let the casserole bake for another 50-60 minutes or until it is golden brown and the center is set.

Your house is going to smell so good and everyone will be asking… “How soon can we eat?”

Tips You’ll Want to Know

• Feel free to customize this bagel egg casserole with your favorite ingredients. Try adding diced bell peppers, onions, or broccoli for added flavor and nutrition.
• If you don’t have bagel seasoning on hand, you can easily make your own by combining sesame seeds, poppy seeds, dried minced garlic, dried minced onion, and coarse salt.
• Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Simply reheat individual portions in the microwave or oven for a quick and satisfying breakfast.
• Don’t forget to save this recipe for next time! It’s sure to become a family favorite that you’ll want to make again and again.

Why You’ll Love This

This easy breakfast recipe is the perfect dish for a savory breakfast that’s both easy to make and delicious. Packed with flavorful bagel chunks, cheese, and breakfast sausage, this casserole is sure to impress all the taste buds in your house!

Try it out for your next breakfast or brunch gathering and watch it disappear in no time!

Cheers!

Don’t Forget to Pin It!

Pin the image below to your boards on Pinterest (just click the Pin button in the top left corner). You can also follow along with me on Pinterest!

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