This Everything Bagel Breakfast Casserole is a savory and satisfying dish that’s perfect for brunch or a weekend breakfast. It’s packed with the flavors of everything bagels, breakfast sausage, cream cheese, and Gruyère cheese. This casserole is sure to be a hit with everyone at the table.

Why You’ll Love This Recipe

Unique and Flavorful: Combines the distinct flavor of everything bagels with classic breakfast ingredients.
Hearty and Satisfying: A filling casserole that’s perfect for feeding a crowd.
Make-Ahead Friendly: Can be assembled ahead of time and baked when needed.

Ingredients

Here’s what you’ll need to make this delicious Everything Bagel Breakfast Casserole:

Everything bagels: Cut into cubes, for a flavorful base.
Breakfast sausage: Cooked and crumbled, for a savory protein.
Cream cheese: Softened, for a creamy and tangy base.
Whole milk: Adds moisture and creaminess.
Large eggs: For binding and richness.
Everything bagel seasoning: Adds the signature everything bagel flavor.
Gruyère cheese: Shredded, for a nutty and melty cheese.
Sliced green onions: For garnish (optional).

Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

How to Make Everything Bagel Breakfast Casserole

Step 1: Prepare the Bagels

Preheat the oven to 375 degrees Fahrenheit (190 degrees Celsius).
Spread the cubed everything bagels on a parchment-lined baking sheet.
Toast the bagels in the oven for about 8 minutes, stirring halfway through, until dry and toasty.
Remove from the oven and let cool completely.

Step 2: Prepare the Cream Cheese Mixture

Heat the cream cheese in a large bowl in the microwave for 20-30 seconds until very soft.
Use a hand mixer to beat the cream cheese until smooth.
Slowly mix in the whole milk and everything bagel seasoning.
Whisk until smooth and creamy.

Step 3: Add Eggs and Cheese

Whisk in the large eggs.
Stir in the shredded Gruyère cheese.

Step 4: Assemble the Casserole

Once the bagel pieces are cooled, add them to a bowl with the cooked breakfast sausage and the egg mixture.
Toss until fully combined.
Cover and let soak for 15-20 minutes.

Step 5: Bake the Casserole

Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius).
Spray a 4-quart baking dish with pan spray.
Transfer the soaked mixture to the prepared dish.
Sprinkle the top with additional everything bagel seasoning.
Bake for 30-35 minutes, or until a knife comes out clean and the casserole doesn’t jiggle.

Step 6: Serve

Let the casserole sit for 5 minutes before adding sliced green onions for garnish.
Serve warm.

Pro Tips for Making the Recipe

Use Day-Old Bagels: Day-old bagels work best as they absorb the egg mixture better.
Toast the Bagels: Toasting the bagels ensures they don’t get soggy in the casserole.
Customize the Ingredients: Use your favorite breakfast meats, cheeses, and vegetables.
Soak the Bagels: Soaking the bagels in the egg mixture allows them to absorb the flavors and become tender.
Check for Doneness: The casserole is done when a knife inserted into the center comes out clean.

How to Serve

Brunch: Serve this casserole as a main dish for brunch.
Weekend Breakfast: A perfect dish for a leisurely weekend breakfast.
Holiday Meal: A crowd-pleasing option for holiday mornings or gatherings.

Make Ahead and Storage

Storing Leftovers

Store leftover casserole in an airtight container in the refrigerator for up to 3 days. Reheat in the oven or microwave until warmed through.

Freezing¹

You can freeze cooked casserole. Wrap individual slices tightly in plastic wrap and then in aluminum foil. Freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.

FAQs

Can I use a different type of cheese?

Yes, you can use other cheeses, such as cheddar, Monterey Jack, or mozzarella.

Can I add vegetables to the casserole?

Yes, you can add cooked vegetables, such as bell peppers, onions, or spinach.

Can I make this casserole without meat?

Yes, you can omit the breakfast sausage or use a vegetarian alternative.

Can I use milk instead of cream cheese?

Using a higher amount of milk will change the texture and flavor, it is recommended to use cream cheese for the creamiest results.