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Breakfast · Part 2 of 3: Instructions

Overnight Breakfast Egg Casserole with Crispy Bacon Step-by-step instructions

A golden, bubbly breakfast casserole in a glass dish with melted cheese and fresh herbs on top.
Prep
Cook
Total
Serves
8
Includes 10 min resting

Before you start

Before beginning, ensure that all your ingredients are at room temperature, which helps the eggs cook more evenly. Cook the bacon in a skillet until it reaches your desired level of crispiness, then drain it on paper towels to remove excess grease before crumbling it into bite-sized pieces.

Shred your cheese if using a block, and have your baking dish greased and ready on the counter. Preheating the oven early ensures that the temperature is stable the moment your casserole is ready to be baked.

Ingredients at a glance (4)
  • 8 slices bacon, cooked and crumbled
  • 12 large eggs
  • 2 cups sharp cheddar cheese, shredded
  • 1 tbsp fresh herbs, chopped

Instructions

Preparation and Whisking

  1. Prepare the Base
    Preheat the oven to 350°F (175°C). Grease a 9x13 inch glass baking dish thoroughly. In a large bowl, whisk the eggs until the yolks and whites are fully combined and the mixture is airy.
    Look for The egg mixture should be pale yellow and slightly frothy.
    Tip Whisking vigorously incorporates air, which helps the casserole bake into a light and fluffy texture.

The egg mixture should be pale yellow, airy, and completely uniform in color. Check that your baking dish is thoroughly greased to prevent sticking. The bacon should be perfectly crispy and crumbled, ready to be layered. Ensure the oven has reached the target temperature of 350°F (175°C) before proceeding, as a consistent start is essential for the structure of the eggs to form correctly during the initial phase of baking.

Assembly of Layers

  1. Assemble the Casserole
    Layer the crumbled bacon evenly across the bottom of the prepared baking dish. Pour the whisked eggs over the bacon. Sprinkle the shredded cheddar cheese across the top, ensuring even coverage for a perfect melt.
    Look for The cheese should form a solid layer over the top of the egg mixture.
    Tip Ensure the bacon is distributed evenly so every portion gets a bit of the savory crunch.

The bacon should be distributed in an even layer across the bottom of the dish, providing a savory foundation. When you pour the egg mixture over, ensure it reaches all corners.

The cheese layer must be generous, completely covering the egg base to create a protective, flavorful crust. Verify that no large gaps exist in the cheese coverage, as this ensures a consistent melt across the entire surface of the casserole once it enters the oven.

Baking and Resting

  1. Bake and Serve
    Place the dish in the oven and bake for 45 minutes. The casserole is done when it reaches an internal temperature of 160°F (71°C) and the center is set. Remove from the oven, garnish with fresh herbs, and let rest for 10 minutes before slicing.
    Look for The top should be golden brown and bubbling, and the eggs should be firm to the touch.
    Safe temperature 160°F (71°C) internal temperature (egg dishes)
    Tip Letting the dish rest allows the layers to set, making it easier to scoop out clean portions.

At the end of the baking cycle, the top of the casserole should be golden brown and bubbling with melted cheese. The eggs should feel set rather than liquid when the center is gently pressed. The smell will be savory and rich. After removing it from the oven, allow it to rest for at least 10 minutes. This resting phase is critical, as it allows the internal heat to distribute evenly and the structure to firm up for clean slicing.

Common mistakes

A common mistake is failing to whisk the eggs sufficiently, which can lead to a dense, flat casserole. Another error is adding the cheese too early or using low-quality cheese that does not melt well.

Avoid overcrowding the dish with too many heavy mix-ins, as this can prevent the eggs from rising properly. Finally, do not rush the cooling period; slicing the casserole immediately out of the oven can cause it to lose its structural integrity and become messy on the plate.

How to tell it’s done

The casserole is fully cooked when the center is firm to the touch and the internal temperature reaches 160°F (71°C) when measured with a food thermometer. You will notice the eggs have puffed up slightly and the cheese on top has melted into a deep golden, bubbling crust.

Because eggs are a protein, ensure you do not overcook them, as this can lead to a dry texture. A ten-minute rest after pulling it from the oven is vital for the structure to set.

  • Egg dishes: 160°F (71°C) in the thickest part

Coming up in Part 3: common questions

  • Can this be made ahead of time?
  • How do you prevent the casserole from becoming watery?
  • Why is the center of the casserole not setting?

Also in Part 3: variations (Veggie Delight, Spicy Kick), storage and make-ahead, and the printable recipe card.

Up next · Part 3 of 3

2 variations · storage & make-ahead · 3 answers · printable card

Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)