Easy Breakfast Casserole

Start your day with a burst of flavor and simplicity with our Easy Breakfast Casserole—a delightful medley of eggs, savory ingredients, and gooey cheese baked to perfection. This no-fuss recipe is designed to make mornings a breeze, whether you’re feeding a hungry family or preparing a cozy brunch for friends. Join us on a culinary journey as we explore the ingredients, guide you through the step-by-step instructions, share cook notes and variations, and provide keto and low-carb versions. Get ready to elevate your breakfast game with the irresistible appeal of Easy Breakfast Casserole!


Base Ingredients:

  • 8 large eggs
  • 1 cup milk
  • Salt and pepper to taste

Additional Ingredients:

  • 1 pound breakfast sausage, cooked and crumbled
  • 2 cups shredded cheddar cheese
  • 1 cup diced bell peppers (any color)
  • 1 cup diced onions
  • 1 cup sliced mushrooms
  • 1 cup spinach leaves, chopped
  • 1 cup cherry tomatoes, halved

Optional Toppings:

  • Chopped fresh herbs (parsley, chives, or cilantro)
  • Hot sauce or salsa


Preparing the Casserole:

  1. Preheat the Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
  2. Whisk the Egg Mixture: In a large bowl, whisk together eggs, milk, salt, and pepper until well combined.
  3. Layer the Ingredients: Spread the cooked and crumbled breakfast sausage evenly in the bottom of the baking dish. Layer with shredded cheddar cheese, bell peppers, onions, mushrooms, spinach, and cherry tomatoes.
  4. Pour the Egg Mixture: Pour the whisked egg mixture over the layered ingredients, ensuring it evenly covers the casserole.

Baking to Perfection:

  1. Bake Until Set: Place the baking dish in the preheated oven and bake for 35-40 minutes or until the center is set, and the edges are golden brown.
  2. Check for Doneness: Insert a knife or toothpick into the center; if it comes out clean, the casserole is ready.
  3. Let It Rest: Allow the casserole to rest for a few minutes before slicing.

Cook Notes

  • Make-Ahead Convenience: Prepare the casserole the night before, cover it with plastic wrap, and refrigerate. Pop it in the oven the next morning for a hassle-free breakfast.
  • Customize with Your Favorites: Tailor the casserole to your taste by adding your favorite ingredients, such as diced ham, crumbled bacon, or different types of cheese.
  • Adjust Veggie Freshness: For a crispier texture, sauté the veggies briefly before adding them to the casserole. If you prefer a softer texture, add them raw.


1. Mexican Fiesta:

Add a Tex-Mex twist by incorporating ingredients like diced jalapeños, black beans, and a sprinkle of taco seasoning. Top with avocado and salsa for a fiesta in every bite.

2. Mediterranean Delight:

Elevate the flavors with ingredients like feta cheese, Kalamata olives, and a pinch of oregano. Serve with a dollop of tzatziki for a Mediterranean-inspired breakfast.

3. Garden Veggie:

Load up on vegetables like zucchini, broccoli, and asparagus for a fresh and wholesome casserole. Experiment with different herbs like basil and thyme.

Keto Versions

For those on a keto journey, consider these modifications:

  • Replace Milk with Heavy Cream: Substitute milk with heavy cream for a higher fat content and lower carb count.
  • Use Low-Carb Veggies: Opt for low-carb vegetables like bell peppers, onions (in moderation), spinach, and mushrooms. Avoid higher-carb options like tomatoes.
  • Experiment with Keto-Friendly Cheese: Explore keto-friendly cheese options such as mozzarella, cheddar, or cream cheese for added richness.

Low-Carb Version

To cater to low-carb preferences, make these adjustments:

  • Replace Milk with Unsweetened Almond Milk: Choose unsweetened almond milk instead of regular milk to reduce the carb content.
  • Limit High-Carb Veggies: Select low-carb vegetables like bell peppers, onions (in moderation), and spinach. Minimize or omit higher-carb vegetables.
  • Incorporate Low-Carb Proteins: Include proteins like turkey sausage or chicken sausage with lower carb content.

Easy Breakfast Casserole is a versatile and fuss-free way to kickstart your day with a satisfying and flavorful meal. Whether you follow the classic recipe, experiment with enticing variations, or tailor it to keto and low-carb preferences, this casserole is a breakfast delight. So, preheat your oven, gather your favorite ingredients, and revel in the joy of creating a breakfast masterpiece that suits your taste and lifestyle. Here’s to mornings filled with the aroma of a freshly baked Easy Breakfast Casserole—a breakfast ritual that promises to make each day a delicious journey!

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