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Overnight Everything Bagel Breakfast Casserole is an easy make-ahead recipe perfect for breakfast or brunch. Featuring toasted bagels, eggs, sausage, cream cheese, and tater tots, this hearty dish is loaded with flavor and texture. Ideal for feeding a crowd or meal prepping, it’s a versatile and customizable option that’s sure to become a family favorite. Bake it fresh in the morning for a warm, satisfying start to your day

Ingredients

6 everything bagels, lightly toasted and broken into bite-sized pieces
8 large eggs
1 cup half-and-half
Salt and pepper to taste
2 tablespoons Dijon mustard
1/3 teaspoon cayenne pepper
½ cup shredded Parmesan cheese
1 cup grated cheddar cheese, divided
8 oz cooked sausage links, diced
½ bell pepper, diced
8 oz cream cheese, cut into small squares
1 cup tater tots
Green onions for garnish

Instructions

Prepare the Casserole Base
Lightly butter a 9×13 casserole dish. Break the toasted bagels into bite-sized pieces and spread them evenly in the dish.
Make the Egg Mixture
In a large mixing bowl, whisk together the eggs, half-and-half, Dijon mustard, cayenne pepper, salt, and pepper for about 1 minute until fully combined.
Assemble the Casserole
Pour the egg mixture evenly over the bagel pieces, ensuring each piece is soaked. Sprinkle the Parmesan cheese and ½ cup of cheddar cheese over the mixture. Gently toss with a spoon to coat the bagels evenly.
Add the Toppings
Arrange the cream cheese squares, diced sausage, bell peppers, and tater tots on top of the casserole. Sprinkle the remaining ½ cup of cheddar cheese over the top.
Chill and Bake
Cover the casserole with plastic wrap and refrigerate for at least 4 hours, or overnight for best results.
When ready to bake, preheat the oven to 350°F. Bake the casserole covered for 40 minutes. Remove the cover and bake for an additional 15 minutes, or until the top is golden and the casserole is cooked through.
Rest and Serve
Let the casserole cool for 10 minutes before garnishing with chopped green onions. Serve warm with your favorite breakfast beverages.

Why You’ll Love This Recipe

This Overnight Everything Bagel Breakfast Casserole is the ultimate make-ahead breakfast dish. Packed with hearty bagels, savory sausage, creamy cheese, and crispy tater tots, it’s a one-pan solution for feeding a crowd. Its prep-ahead convenience and customizable ingredients make it ideal for holidays, brunches, or busy mornings.

Tips

For best flavor: Use fresh, high-quality bagels and toast them lightly for added texture.
Prep early: The casserole benefits from sitting overnight, allowing the flavors to meld and the bagels to absorb the egg mixture fully.
Bake evenly: Cover with foil during the first part of baking to ensure the casserole doesn’t dry out.

Variations and Substitutions

Vegetarian option: Skip the sausage and add more veggies like mushrooms, spinach, or zucchini.
Different bagels: Swap everything bagels with plain, sesame, or onion bagels for a new flavor profile.
Cheese choices: Experiment with gouda, Monterey Jack, or pepper jack instead of cheddar.
Protein alternatives: Use cooked bacon, ham, or turkey sausage instead of traditional sausage links.

FAQs

Q: Can I make this without cream cheese?
Yes! Replace cream cheese with more shredded cheese or omit it for a less creamy texture.

Q: How long can this be refrigerated before baking?
The casserole can be refrigerated for up to 24 hours before baking.

Q: Can I freeze this casserole?
Yes, you can freeze it unbaked. Thaw overnight in the refrigerator and bake as instructed.

Serving

Serve this casserole hot with a side of fresh fruit, yogurt, or a simple green salad. Pair it with orange juice, coffee, or tea for a complete breakfast or brunch spread.

Suggestions

Add a drizzle of hot sauce for extra heat.
Sprinkle some everything bagel seasoning on top before baking for added flavor.
Use leftovers as a quick and hearty breakfast throughout the week.