Egg and Sausage Keto Breakfast Casserole Recipe
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A keto breakfast casserole is one of the most delicious ways to start the day. Ready to serve in 35 minutes, it’s a flavorful and savory meal with sausage, egg, and cheese that you’ll make again and again.
This easy make-ahead low-carb breakfast recipe is perfect not just for casual family breakfasts but for holidays and weekend brunch as well. Bake it the night before, store leftovers in the refrigerator in an airtight container, and eat a cold breakfast or heat a portion in the oven before serving.
The dish would also be great for those interested in carnivore diet recipes, too. Remove the thyme and aromatics, and you have a carnivore breakfast that will satiate and give you long-lasting energy for the day!
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Why You’ll Love This Recipe
Consistent meals are essential for building habits around health and improving your healthy daily routine. This low-carb breakfast casserole is easy to throw together for a quick yet filling meal and is definitely one of my favorite keto breakfast recipes. If you haven’t tried it yet, I highly suggest you do! Here’s why:
- Simple ingredients: The recipe calls for fresh ingredients you may already have on hand. No fancy ingredients needed!
- Short prep and cooking time
- Amazing flavors: Low on carbs but big on flavor, this hearty and savory dish is a satisfying blend of meaty, creamy, and cheesy that the whole family will go crazy for.
- Family-friendly and kid-approved
- Basic kitchen equipment: All you need are a few simple kitchen helpers such as a mixing bowl, a whisk, a baking or casserole dish, and of course, an oven.
- Easy-to-follow directions
How to Make Keto Breakfast Casserole
Brown the sausage, combine with the egg mixture and bake to golden-brown perfection. You now have a keto-approved breakfast that’s bound to be a huge success at the table!
Scroll to the bottom of this post for a printable recipe card with a full list of ingredients, measurements, and step-by-step instructions.
Ingredients
One of the things I love most about this breakfast sausage casserole recipe is that you don’t need a whole laundry list of ingredients.
- Salt
- Dried thyme
- Onion
- Garlic
- Ground black pepper
- Eggs: I use large eggs in most of my recipes, this one included. These are essential for holding the casserole together and packed with protein and fats while keeping the carbs low. You simply cannot replace eggs with any alternative ingredient!
- Cheese: I prefer the melty tanginess of shredded cheddar cheese and the sharp flavor of Parmesan, but you can get creative and use what you have available or what you like best.
- Sausage: Chicken is my meat of choice here, but in a pinch, you can substitute sausage or ground meat of any kind. Whatever you choose, pre-cook the meat first. Order your ingredients online from White Oak Pastures or US Wellness for high-quality meats.
However you decide to do it, breakfast casseroles are convenient and healthy staples for weekly keto meal prep. Make sure these ingredients are on your keto shopping list the next time you head out to the store.
Step-by-Step Instructions
As you know, I’m all about simplicity, and this easy keto breakfast casserole recipe is just that. Follow these steps, and you’ll create the perfect casserole even on your first try!
Step 1: Sauté the aromatics
While preheating the oven, sauté the onion and garlic in a pan with melted butter over medium-high heat.
Step 2: Cook the sausage
Remove the sausage from its casing and add it to the pan. Break into smaller pieces and brown all sides evenly.
Step 3: Whisk the egg mixture
As the sausage cooks, whisk the eggs in a bowl along with shredded cheese, thyme, and seasonings.
Step 4: Combine ingredients
Once cooked, transfer the meat to a casserole dish, arrange it in a single layer on the bottom, then pour the egg mixture on top. Carefully jiggle or tap the dish until the egg mixture settles around the meat.
Step 5: Bake and serve
Place in the oven and bake until the eggs are set and the crust is golden brown. Allow to rest for 5 minutes before slicing. Serve warm and enjoy!
Love baking? I highly recommend my cookbook, The Ultimate Guide to Low-Carb Baking, for all you need to know about healthy, family-friendly sweet and savory baked goods.
Variations and Substitutions
Once you learn the basic steps of making my keto breakfast casserole, you can branch out and fully customize it exactly how you like it best.
Poke through the fridge and pull out any leftover ingredients that need to be used up. This is a very forgiving recipe, so don’t be afraid to experiment!
- Cheese: Choose any shreddable cheese like Colby, Monterey Jack, pepper jack, cheddar, feta, mozzarella, or Swiss. Provolone and gruyere are just as fabulous in this recipe.
- Low-carb or keto: My recipe is already perfect for anyone on a low-carb diet. Try adding different veggies like sautéed mushrooms, spinach, zucchini, broccoli, or leeks. Bell peppers are great, too. You can also mix and match different herbs like rosemary, basil, parsley, or oregano.
- Spicy: Have a favorite hot sauce? Mix in a tablespoon along with the eggs and bake it all together!
- Carnivore diet: Since the ingredient list in this casserole recipe is mostly sausage, egg, and cheese, the recipe is easily modified for a carnivore diet by omitting onion, garlic, thyme, and black pepper.
- Proteins: Instead of chicken sausage, change things up by using other types of meat like ground beef, diced ham, pulled pork, or roast turkey.
Expert Tips
- Choose high-quality sausage. Choose sausage without fillers, added sugars, or any “hidden” ingredients. Check the labels first to ensure it’s keto-friendly.
- Avoid overmixing the eggs. Whisking the eggs too much can make them tough. Gently mix with the other ingredients until just combined, with no visible streaks of yolk or white.
- Bake at the right temp: Bake your keto breakfast casserole at 350 F (175 C) until the egg mixture is set and golden on top. To check for doneness, insert a toothpick or knife in the center. It should come out clean.
How to Store This Recipe
A keto breakfast casserole is a great make-ahead and freezer meal option. If you’re meal-prepping or have leftovers, cool completely before storing to prevent the casserole from becoming soggy. You can store it in an airtight container or cover it tightly with plastic wrap. It will keep in the fridge for 4 to 5 days.
For longer storage, freeze the casserole in individual portions before storing so they’re easier to grab and go. If stored in freezer-safe containers or bags, they can last as long as 3 months.
When ready to enjoy, thaw in the fridge overnight, then reheat in the oven until piping hot. Make sure to reheat only the portion you plan to eat because repeated reheating can change the texture and taste of your casserole.
How to Serve Egg and Sausage Casserole
Egg bake dishes like this one are the perfect fit for everyday meal prep and even special brunches when entertaining guests. When feeding a crowd, double this recipe and bake in a 9×13-inch dish.
I often pair with a warm cup of bulletproof tea or coffee. Sometimes, I also add a side dish like a kale salad with apples and raspberries or a simple cucumber salad, for a refreshing contrast to the savory meal.
More Keto Casserole Recipes to Try
Loving the simplicity of casseroles? Try these too!
- Carnivore Casserole with Ground Beef
- Philly Cheesesteak Casserole
- Green Bean Hamburger Casserole
- Cheesy Keto Casserole
- Buffalo Chicken Casserole
Keto Breakfast Casserole
Video
Ingredients
- 1 tablespoon butter
- 1 medium onion diced
- 2 cloves garlic minced
- 1 pound chicken sausage
- 10 whole eggs
- 1 cup cheddar cheese shredded
- ¼ cup Parmesan shredded
- ½ teaspoon dried thyme
- ½ teaspoon salt
- ½ teaspoon ground black pepper
Instructions
- Preheat the oven to 350 °F (175°C).
- Warm butter in a frying pan over medium heat. Sauté the onion and garlic together for 5 minutes.
- Remove the sausage from its casing and add to the pan also. Break apart into smaller pieces and brown all sides evenly, about 8 minutes.
- While the sausage browns, whisk 10 eggs in a large bowl. Mix in the cheese, thyme, salt, and pepper.
- Transfer meat to an 8×8-inch (20×20 cm) glass baking or casserole dish. Arrange in a single, even layer on the bottom.
- Pour the egg mixture over the meat. Gently jiggle or tap the dish so the egg can settle down around the meat.
- Bake for 20 minutes, until eggs are set and top is golden brown. Let rest 5 minutes before slicing and serving warm.
Notes
Nutrition & Macros
To obtain the most accurate representation of the nutritional information in a given recipe, please calculate the nutritional information with the actual ingredients and amounts used, using your preferred nutrition calculator. Under no circumstances shall the this website and the author be responsible for any loss or damage resulting for your reliance on the given nutritional information.
The breakfast egg casserole is delicious! I’ve made it several times. Thank you!!!
Hi Sherrie, we’re so glad to hear you’re enjoying the breakfast egg casserole! It’s definitely a favorite around here too. It’s simple, hearty, and great for making ahead. Thanks for sharing your feedback, and happy cooking!
Your recipe does not say what to do with the butter, onion and garlic. Missing a step.
Hi Yvonne, that information isn’t missing. These ingredients are included in step 2 of the recipe card: Warm butter in a frying pan over medium heat. Sauté the onion and garlic together for 5 minutes.
Just made these Keto drop biscuits with buttermilk, and I’m genuinely impressed! They had the right texture and flavor I’ve been missing since starting keto. Super easy to make, and they paired perfectly with my morning coffee. Highly recommend to anyone missing biscuits on their keto journey!
Thank you for the comment, Lucy. We strive to make the keto diet as enjoyable as possible, and love hearing when one of our recipes helps kill those diet cravings.