Keto Low-Carb Egg Breakfast Casserole

This Keto Low-Carb Egg Breakfast Casserole is packed with protein, veggies, and cheese, this delicious dish is perfect for meal prep or feeding a crowd. This casserole is not only easy to make but also the perfect meal-ahead dish for meal planning, allowing you to enjoy a hearty, guilt-free breakfast with cheese, spinach, and peppers throughout the week. Serve this dish for your holiday breakfasts and brunch!

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Why Readers Love This Recipe

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Loooooove this recipe! I made it this past weekend and have been eating it for breakfast for the last 3 days. Looking forward to trying more of your recipes.
~Jas

This low-carb bacon, egg, and spinach breakfast casserole has rescued my mundane breakfast! For several months now, I have been eating the same breakfast every day.

You may also enjoy these other Keto Breakfast Recipes: Keto Bacon Egg Bites and Keto Blueberry Muffins.

Key Ingredients

Together, these ingredients create a savory, satisfying, and low-carb breakfast casserole….that I’ve been obsessed with for years!

• Eggs – The backbone of any breakfast casserole, eggs provide structure, protein, and richness, binding all the ingredients together for a fluffy, satisfying texture.
• Spinach – It’s nutrient-dense and adds fiber, vitamins, and a pop of color while keeping the dish light and fresh. Plus, it’s a great way to sneak in extra veggies without adding many carbs.
• Bacon – Who doesn’t love it? It adds a smoky, salty, and crispy element that enhances flavor while providing protein and fat to keep the casserole hearty and satisfying. Use sausage if that’s more your speed!
• Bell Peppers – A touch of sweetness and crunch to balance the richness of the eggs and bacon.
• Onions – Brings a subtle sweetness and savory depth to the casserole. Using just a small amount adds great flavor without too many carbs.
• Cheese – Whether it’s cheddar, mozzarella, or a mix, cheese provides creamy richness, melty goodness, and extra fat to keep this dish keto-friendly and delicious.
• Mushrooms – Add a hearty, meaty texture without extra carbs, making this casserole feel like a fluffy omelet.
• Salt and Pepper – Simple but essential, these seasonings enhance all the other flavors, ensuring a well-balanced and delicious bite every time.

How to Make Keto Breakfast Casserole

Detailed measurements and full instructions can be found in the recipe card at the bottom of this post.

1. This casserole is easy to make. The key word here is LAYERS. Create the first layer by adding sauteed veggies to the bottom a baking dish.
2. Next, add frozen spinach.
3. Drizzle the egg mixture throughout.
4. Sprinkle cooked, crumbled bacon and shredded cheese over the top.
5. Bake for 35 minutes.

Substitutions and Add-ins Ideas

Switch it up to suit your tastes and needs.

• Kale, Swiss Chard, or Broccoli – Any leafy green works well, or swap for chopped broccoli for extra fiber.
• Sausage, Ham, or Turkey Bacon – Swap for cooked breakfast sausage, diced ham, or turkey bacon for a different protein option.
• Cherry Tomatoes or Zucchini – If you want lower-carb options, try diced zucchini or a few cherry tomatoes for a slight sweetness.
• Green Onions or Shallots – Green onions provide a milder flavor with fewer carbs compared to regular onions.
• Asparagus or Cauliflower – Other low-carb veggies like asparagus or roasted cauliflower add variety and texture.
• Avocado – Adds good fats and creaminess when sliced on top after baking.
• Jalapeños or Red Pepper Flakes – For a little heat and extra kick.
• Chopped Cooked Chicken or Ground Beef – A heartier protein boost if you want an extra-filling breakfast.
• Cream Cheese or Ricotta – Mix into the eggs for an extra creamy texture.
• Everything Bagel Seasoning – Sprinkle on top for a flavorful, slightly crunchy finish.
• Pesto or Sun-Dried Tomatoes – A spoonful of pesto or chopped sun-dried tomatoes adds richness and depth.

I love casseroles! I really should make them more often. I love to combine a bunch of ingredients that pair well together, and then throw the dish in the oven and get back to life until it is finished baking. Casseroles are also a great way to sneak in nutritious veggies and high protein foods. A casserole will save you from having to prepare multiple side dishes for one meal.

Can You Make it Ahead

You can prepare it ahead of time and store it in the refrigerator for up to 24 hours before baking. Cover the unbaked casserole tightly with plastic wrap or aluminum foil.

When you’re ready to bake, remove the casserole from the refrigerator and let it sit at room temperature for about 15-20 minutes while you preheat the oven.

How to Store and Reheat

If you’ve already baked the casserole, you can store it in the refrigerator for up to 4-5 days. Simply reheat individual portions in the microwave or warm the entire dish in the oven at 350 degrees until warm.

Freezer Tips

Place the casserole or portions in the freezer tightly covered and sealed. It can be frozen for up to 2-3 months (for optimal freshness).

Check out more Low Carb Breakfast Casseroles here with 10 Egg Casseroles You Can Make For Breakfast, Lunch, and Dinner.

Or if you are just looking for breakfast only, you can check out the Low Carb Breakfast Casseroles here with 39 Low Carb Breakfasts You Actually Want to Eat.

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More Low Carb Recipes

Keto Low Carb Bacon Cheeseburger Casserole
Keto Low Carb Philly Cheesesteak Casserole
Keto Low Carb PF Changs Lettuce Wraps
Keto Low Carb Smothered Pork Chops

Click here for a complete listing of Keto Low-Carb Recipes.