Dinner

Everything Bagel Breakfast Casserole Recipe

ByEthan Lark December 9, 2025December 9, 2025

Introduction

This Everything Bagel Breakfast Casserole is a hearty and flavorful way to start your day. Combining savory sausage, creamy cheeses, and fresh toppings, it’s perfect for a weekend brunch or an easy breakfast gathering.

The image shows a baked egg casserole served on a white square plate with a piece cut from a white baking dish beside it. The casserole has about three visible layers: a base layer of a golden, crispy bread or biscuit, a middle layer of melted yellow cheese, and a top layer of cooked eggs mixed with browned sausage pieces, small cubes of red tomatoes, and chunks of green avocado, sprinkled with black and white sesame seeds. Next to the plate is a white ceramic cup with tea inside, a tea bag steeping, and a silver fork placed under the plate. Behind, there is a white egg tray holding brown eggs on a white marbled surface. Photo taken with an iphone --ar 4:5 --v 7

Ingredients

4 organic eggs
4 everything bagels
10 breakfast sausage links
1 cup whole milk
3/4 cup cheddar cheese
1/2 cup mozzarella cheese
1/2 teaspoon stone ground mustard
1/4 teaspoon salt
1 pinch ground black pepper
4 ounces cream cheese
1 tomato
1 avocado

Instructions

Step 1: Preheat the oven to 375 degrees F (190 degrees C).
Step 2: Lightly coat an 8×8-inch or similar size casserole dish with baking spray.
Step 3: Scatter the everything bagel pieces evenly across the bottom of the dish.
Step 4: Distribute the breakfast sausage links and dollops of cream cheese over the bagels.
Step 5: In a bowl, whisk together the eggs, whole milk, cheddar cheese, mozzarella cheese, stone ground mustard, salt, and black pepper. Pour this mixture evenly over the bagel and sausage layers.
Step 6: Bake for 40-45 minutes, or until the center is set and the edges are golden brown.
Step 7: Remove from oven and top with sliced tomato and avocado.
Step 8: Allow to cool for 10 minutes before slicing and serving.

Tips & Variations

Use turkey sausage or a vegetarian sausage alternative to adjust the protein and flavor.
For extra crunch, sprinkle some toasted sesame seeds on top before baking to enhance the everything bagel flavor.
Fresh herbs like chives or parsley can be added on top for a bright finish.

Storage

Store leftovers covered in the refrigerator for up to 3 days. Reheat individual portions in the microwave for about 1-2 minutes or until warmed through. Avoid freezing, as the fresh toppings like avocado and tomato do not hold up well to freezing.

How to Serve

The image shows a slice of a breakfast casserole on a white square plate on a white marbled surface. The casserole has three visible layers: a golden brown, slightly crispy top layer with browned sausage chunks and melted cheese; a middle light yellow layer of cooked eggs; and a bottom layer that is softer and paler, possibly a mix of eggs and other ingredients. The top is garnished with bright red diced tomatoes and green avocado chunks, along with small black and white sesame seeds scattered. Next to the plate is a white ceramic mug with a tea bag inside, a fork placed at the bottom edge of the plate, and a white baking dish with more casserole visible in the upper left corner. The top right corner shows a white egg tray with four light brown eggs. The overall setting is bright and neat, with a clean white marbled background. Photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I make this casserole ahead of time?

Yes, you can assemble the casserole a day in advance and refrigerate it. Bake it just before serving, adding a few extra minutes to the baking time if baked straight from the fridge.

Can I use other types of bread instead of everything bagels?

Absolutely. Any sturdy bread like ciabatta or a crusty sourdough works well as a substitute and will soak up the egg mixture while providing a similar texture.