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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Overnight Everything Bagel Breakfast Casserole

4.6 from 5 votes
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.

Ingredients

  • 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

Instructions

  • Break the bagels into bite-sized pieces and place into a buttered 9x13 casserole dish.
  • In a large bowl, crack the eggs. Add the half and half, mustard, cayenne pepper, and salt/pepper. Whisk briskly for 1 minute.
  • Pour the egg mixture over the bagel pieces, try to cover each one.
  • Add the Parmesan cheese and ½ cup cheddar cheese to the casserole dish. Use a spoon to gently toss the casserole mixture.
  • Cut the cream cheese into 14 squares.
  • Distribute the top of the casserole with the cream cheese, sausage, bell peppers, and tator tots.
  • Top with the remaining half of cheddar cheese.
  • Cover and refrigerate for 4 hours or overnight. The longer it sits, the better/moister it will be.
  • Bake, covered, at 350 degrees for 40 minutes.
  • Remove the cover and bake for 15 more minutes.
  • Let cool for 10 minutes. Serve with coffee and enjoy!

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

Calories: 619kcal, Carbohydrates: 49g, Protein: 27g, Fat: 34g, Saturated Fat: 15g, Cholesterol: 246mg, Sodium: 1061mg, Potassium: 373mg, Fiber: 2g, Sugar: 1g, Vitamin A: 1210IU, Vitamin C: 11.1mg, Calcium: 276mg, Iron: 2.6mg