Overnight Everything Bagel Breakfast Casserole

This easy make-ahead Everything Bagel Breakfast Casserole can be prepared up to 3 days ahead of time! It’s made with sausage, tator tots or hash browns, a delicious 3-cheese combo, and more!

Be sure to try my make-ahead freezer breakfast sandwiches  and my Tater Tot Breakfast Casserole (Make-Ahead!) recipe next!

Overnight everything bagel casserole in a casserole dish with a glass of orange juice in the background.

Everyone loves a good ol’ everything bagel (they’re the second most popular after plain) but when you throw it into a casserole with a loaded egg scramble and three cheeses, it becomes breakfast heaven.

Making this ahead of time is the best part; you wake up with that craving for a bagel and some eggs, and all you have to do is pop the casserole in the oven, grab a cup of coffee, and relax.

overhead shot of ingredients needed to make overnight everything bagel breakfast casserole.

Ingredients for this Breakfast Casserole

  • Everything Bagels– (Any kind of bagel will work). Fresh, lightly toasted bagels have the best flavor and texture.
  • Tator Tots– Frozen hash browns, (shredded or diced), also work!
  • Sausage- Other Options include turkey sausage or cooked and crumbled bacon.
  • Half and Half- Heavy cream may also be used. (Milk can as well, but won’t be as creamy.)
  • Bell Peppers- Onions may also be added
  • Parmesan Cheese
  • Cheddar Cheese
  • Cream Cheese
  • Eggs
  • Dijon Mustard
  • Cayenne Pepper- Optional
  • Green Onions- Chives would work as well.

Additional Breakfast Casserole Ingredients

In addition to the bell peppers and sausage, you can also incorporate these ingredients:

  • Sautéed or caramelized onions, mushrooms, spinach, garlic, and tomatoes.
  • Other cheese options include pepper jack, Swiss, gouda, and mozzarella.

pouring custard over everything bagels to make a breakfast casserole

How Long Can You Refrigerate Uncooked Breakfast Casserole

  • This uncooked breakfast casserole can be stored in refrigerator for up to 2-3 days prior to baking.

Freezing Breakfast Casserole

  • Breakfast casserole can be frozen for up to 3 months.
  • To reheat, allow it to defrost in the fridge overnight and bake at 350 for 20-25 minutes, covered. 

breakfast casserole before and after being baked

Storing Leftover Breakfast Casserole

If you don’t plan to freeze the leftovers, they can be stored in the refrigerator for up to 3 days. 

A spatula pulling up a slice of everything bagel breakfast casserole from casserole dish with orange juice in background.

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4.6 from 5 votes
Overnight Everything Bagel Breakfast Casserole
Prep Time:
25 mins
Cook Time:
55 mins
Total Time:
1 hr 20 mins

This easy make-ahead breakfast is loaded with delicious bites of everything bagels baked in a flavorful egg scramble with sausage, peppers, and a three-cheese combination.

  • 6 everything bagels lightly toasted
  • 8 large eggs
  • 1 cup half and half
  • Salt/pepper to taste
  • 2 tablespoons Dijon mustard
  • 1/3 teaspoon cayenne pepper
  • ½ cup Parmesan shredded
  • 1 cup grated cheddar divided
  • 8 oz. cooked sausage links diced
  • ½ bell pepper diced
  • 8 oz. cream cheese
  • 1 cup tater tots
  • Green Onions to garnish
  1. Break the bagels into bite-sized pieces and place into a buttered 9x13 casserole dish.
  2. In a large bowl, crack the eggs. Add the half and half, mustard, cayenne pepper, and salt/pepper. Whisk briskly for 1 minute.
  3. Pour the egg mixture over the bagel pieces, try to cover each one.
  4. Add the Parmesan cheese and ½ cup cheddar cheese to the casserole dish. Use a spoon to gently toss the casserole mixture.
  5. Cut the cream cheese into 14 squares.
  6. Distribute the top of the casserole with the cream cheese, sausage, bell peppers, and tator tots.
  7. Top with the remaining half of cheddar cheese.
  8. Cover and refrigerate for 4 hours or overnight. The longer it sits, the better/moister it will be.
  9. Bake, covered, at 350 degrees for 40 minutes.
  10. Remove the cover and bake for 15 more minutes.
  11. Let cool for 10 minutes. Serve with coffee and enjoy!
Recipe Notes

*Lightly toasted bagels are able to absorb the custard much better, but still have all of the flavor that fresh bagels have. Stale bagels can also be used but I prefer fresh and toasted!

Nutrition Information
Calories: 619, Fat: 34g, Saturated Fat: 15g, Cholesterol: 246mg, Sodium: 1061mg, Potassium: 373mg, Carbohydrates: 49g, Fiber: 2g, Sugar: 1g, Protein: 27g, Vitamin A: 1210%, Vitamin C: 11.1%, Calcium: 276%, Iron: 2.6%
Author: Stephanie
Course: Breakfast
Cuisine: American
Keyword: Breakfast Casserole Recipe, Everything Bagel Breakfast Casserole, Overnight Breakfast Casserole, Overnight Everything Bagel Casserole