Keto Breakfast Casserole

There are mornings when I want breakfast to be slow, cozy, and comforting—but I definitely don’t want to stand over the stove making individual eggs for everyone.

That’s when I make this Keto Breakfast Casserole.

It’s cheesy, savory, loaded with eggs and sausage, and incredibly easy to prepare. Everything goes into one baking dish, which means less time cooking and fewer dishes waiting for me afterward.

I first made this casserole on a weekend when my family was all home for breakfast.

I had eggs in the refrigerator, some breakfast sausage, cheese, and a few vegetables that needed to be used. Instead of making separate plates, I decided to throw everything together into a casserole.

While it baked, the whole kitchen started smelling like sausage, melted cheese, and buttery eggs.

Everyone kept wandering into the kitchen asking when breakfast would be ready.

When I finally pulled it from the oven, the cheese was bubbling and golden around the edges.

We cut it into squares and served it hot.

There wasn’t much left by the end of breakfast.

Now it’s one of my favorite recipes for busy mornings, weekend brunches, and those days when I want something filling without loading up on carbs.

The best part?

You can prepare it the night before, refrigerate it, and simply bake it in the morning.

Recipe at a Glance

Prep Time: 15 minutes
Cook Time: 35–45 minutes
Total Time: About 1 hour
Servings: 8
Course: Breakfast, Brunch
Cuisine: American
Diet: Keto / Low-Carb

Ingredients

• 10 large eggs
• 1 pound breakfast sausage
• 1 cup shredded cheddar cheese
• ½ cup shredded mozzarella cheese
• ½ cup heavy cream
• ½ cup diced bell pepper
• ¼ cup diced onion
• ½ teaspoon garlic powder
• ½ teaspoon salt
• ¼ teaspoon black pepper
• ¼ teaspoon smoked paprika
• 1 tablespoon butter or olive oil

Optional Add-Ins

• Cooked bacon
• Diced ham
• Spinach
• Mushrooms
• Green onions
• Jalapeños
• Feta cheese
• Cream cheese
• Fresh parsley

How to Make Keto Breakfast Casserole

1. Preheat the Oven

Preheat your oven to 375°F (190°C).

Lightly grease a 9×13-inch baking dish with butter or cooking spray.

Set aside.

2. Brown the Sausage

Heat a large skillet over medium heat.

Add the breakfast sausage and cook until browned and completely cooked through.

Break it apart with a spatula as it cooks.

Drain excess grease if necessary.

Set aside.

3. Cook the Vegetables

Using the same skillet, add the diced bell pepper and onion.

Cook for approximately 3–4 minutes, until they begin to soften.

Add the spinach if you’re using it and cook until wilted.

Remove from the heat.

4. Whisk the Eggs

Crack the eggs into a large mixing bowl.

Add the heavy cream, garlic powder, salt, black pepper, and smoked paprika.

Whisk until the eggs are smooth and everything is well combined.

5. Layer the Casserole

Spread the cooked sausage evenly across the bottom of the prepared baking dish.

Add the cooked vegetables.

Sprinkle the cheddar and mozzarella over the top.

Pour the egg mixture evenly over everything.

Give the dish a very gentle shake so the egg mixture settles into the layers.

6. Bake

Place the casserole in the preheated oven.

Bake for approximately 35–45 minutes, or until the center is set and the top is lightly golden.

A knife inserted near the center should come out mostly clean.

7. Rest

Remove the casserole from the oven and let it rest for 5–10 minutes before slicing.

This helps the casserole firm up and makes it easier to cut into neat portions.

8. Serve

Slice into squares.

Garnish with fresh parsley or green onions if desired.

Serve warm.

Why You’ll Love This Keto Breakfast Casserole

• Low in carbohydrates
• High in protein
• Filling and satisfying
• Easy one-dish breakfast
• Great for meal prep
• Family-friendly
• Perfect for brunch
• Easy to customize
• Can be made ahead
• Reheats beautifully

My Best Tips

Don’t Overbake It

The eggs will continue cooking slightly after you remove the casserole from the oven.

Take it out when the center is just set.

Overbaking can make the eggs rubbery.

Drain Excess Sausage Grease

Some sausage varieties release quite a bit of fat.

Drain excess grease before adding the sausage to the casserole so the finished dish isn’t overly oily.

Shred Your Own Cheese

Freshly shredded cheese generally melts more smoothly than pre-shredded varieties.

Let It Rest

Those few minutes after baking make a noticeable difference.

The casserole becomes easier to slice and the flavors settle.

Don’t Add Too Many Wet Ingredients

Vegetables such as mushrooms and zucchini release water as they cook.

Cook watery vegetables first and drain them well before adding them.

Can I Make This Without Sausage?

Absolutely.

Replace the sausage with:

• Bacon
• Ham
• Diced chicken
• Ground turkey
• Ground beef

You can also leave the meat out completely and add extra vegetables and cheese.

Can I Use Bacon?

Yes.

Cook the bacon until crisp, crumble it, and add it to the casserole.

Bacon and cheddar are especially delicious together.

Can I Use Ham?

Definitely.

Diced leftover ham is perfect for this recipe.

It’s an easy way to use leftovers after a holiday meal.

Can I Use Turkey Sausage?

Yes.

Turkey sausage can make the casserole a little leaner while keeping plenty of flavor.

Can I Add Spinach?

Absolutely.

Fresh spinach works beautifully.

Cook it briefly until wilted and squeeze out excess moisture before adding it.

Frozen spinach can also be used, but thaw and drain it extremely well.

Can I Add Mushrooms?

Yes.

Sauté the mushrooms first so they release excess moisture.

This prevents the casserole from becoming watery.

Can I Add Broccoli?

Definitely.

Use cooked broccoli florets and chop them into small pieces.

Can I Add Cauliflower?

Yes.

Roasted or steamed cauliflower makes a great low-carb addition.

Make sure it’s well drained.

Can I Add Jalapeños?

Absolutely.

Fresh or pickled jalapeños add a nice kick.

For a milder casserole, remove the seeds and membranes.

Can I Add Cream Cheese?

Yes.

Small pieces of softened cream cheese scattered throughout the casserole create little pockets of creamy, cheesy goodness.

Can I Use Different Cheese?

Definitely.

Try:

• Monterey Jack
• Pepper Jack
• Colby Jack
• Gouda
• Swiss
• Gruyère
• Feta
• Parmesan

Pepper Jack is especially good if you like a little spice.

Can I Make It Dairy-Free?

Yes.

Use an unsweetened dairy-free milk or cream alternative and dairy-free cheese.

Make sure your sausage is also dairy-free if necessary.

Can I Make It Without Heavy Cream?

Absolutely.

You can use unsweetened almond milk, coconut milk, or another low-carb milk alternative.

Heavy cream makes the casserole richer, but it’s not essential.

Is This Really Keto?

It can be.

The basic ingredients are naturally low in carbohydrates, but the exact carbohydrate count depends on the sausage, cheese, vegetables, and other ingredients you use.

Avoid sugary breakfast sausage and high-carb add-ins.

How Many Carbs Are in Keto Breakfast Casserole?

The exact amount depends on your ingredients and serving size.

With low-carb sausage and modest amounts of vegetables, this casserole is generally very low in carbohydrates.

For strict keto tracking, calculate the nutrition using the exact products you use.

Can I Make It Ahead?

Yes—and this is one of the best things about it.

Assemble the casserole, cover it tightly, and refrigerate overnight.

Bake it the next morning.

If the casserole is very cold from the refrigerator, it may need a few additional minutes in the oven.

Can I Freeze It?

Yes.

You can freeze the baked casserole in individual portions.

Allow it to cool completely before freezing.

Wrap portions tightly and place them in freezer-safe containers or bags.

Use within approximately 2–3 months for best quality.

How Do I Reheat Frozen Casserole?

Thaw overnight in the refrigerator.

Then reheat in the microwave or oven until warmed through.

Individual portions are especially convenient for quick breakfasts.

How Long Does It Last in the Refrigerator?

Store leftovers in an airtight container and refrigerate.

They should keep for approximately 3–4 days.

Can I Meal Prep This?

Absolutely.

Cut the casserole into eight portions and store them individually.

Each morning, simply grab one portion and reheat.

It’s an easy grab-and-go breakfast.

Can I Make Muffin-Sized Portions?

Yes.

Grease a muffin tin and divide the sausage, vegetables, cheese, and egg mixture between the cups.

Bake until the egg mixture is set.

You’ll have convenient mini keto breakfast casseroles.

Can I Make This in a Smaller Dish?

Yes.

A smaller baking dish works if you reduce the ingredients proportionally.

The casserole will be deeper, so it may require a little additional cooking time.

Can I Use a Different Baking Dish?

Yes.

A glass, ceramic, or metal baking dish can all work.

Cooking times may vary slightly depending on the material and size of the dish.

Can I Make This Spicy?

Absolutely.

Add:

• Jalapeños
• Pepper Jack cheese
• Crushed red pepper
• Hot sauce
• Cayenne pepper
• Spicy breakfast sausage

What Should I Serve With Keto Breakfast Casserole?

Keep the sides low-carb with:

• Avocado
• Sliced tomatoes
• Fresh berries
• Green salad
• Sautéed spinach
• Roasted asparagus
• Mushrooms
• Cucumber salad
• Salsa
• Sour cream

For a bigger weekend brunch, serve it with avocado, fresh berries, and crispy bacon.

Can I Serve It for Dinner?

Absolutely.

Breakfast for dinner is always a good idea.

Add a simple green salad or roasted vegetables and you’ve got an easy low-carb dinner.

Frequently Asked Questions

Why is my casserole watery?

Usually, excess moisture from vegetables is the culprit.

Cook vegetables such as mushrooms, spinach, zucchini, and frozen broccoli first and drain them thoroughly.

Why is the middle still runny?

The casserole simply needs more time.

Ovens vary, and a deeper casserole will take longer.

Continue baking until the center is set.

Why is my casserole rubbery?

It was probably overbaked.

Eggs become firm and rubbery when exposed to too much heat for too long.

Remove the casserole as soon as the center is set.

Can I use liquid egg whites?

Yes, although the texture and richness will be different.

Whole eggs provide the best flavor and texture for this casserole.

Can I use pre-cooked sausage?

Yes.

If the sausage is already cooked, simply slice or crumble it and add it directly to the casserole.

Can I add salsa?

Yes.

Choose a low-carb salsa and either spoon it over individual servings or add a small amount to the casserole.

Can I add avocado before baking?

I recommend adding avocado after baking.

It tastes much better fresh and creamy.

Can I make it vegetarian?

Yes.

Leave out the sausage and add extra vegetables, eggs, and cheese.

Approximate Nutrition

For 1 of 8 servings, depending on the exact ingredients:

• Calories: approximately 400
• Protein: approximately 25–30g
• Fat: approximately 30g
• Total Carbohydrates: approximately 5–7g
• Fiber: approximately 1g
• Net Carbohydrates: approximately 4–6g

Nutrition is an estimate and will vary based on the sausage, cheese, vegetables, and serving size.

Final Thoughts

There are some breakfasts that require a lot of effort.

This isn’t one of them.

That’s exactly why I love this Keto Breakfast Casserole.

You can make it on a quiet Sunday morning when everyone is gathered around the kitchen, or prepare it the night before when you know the next morning is going to be busy.

I love the smell of it baking.

The sausage gets savory and browned.

The cheese melts into the eggs.

The vegetables add little pops of flavor throughout.

And when the casserole comes out of the oven, the top is golden and bubbling while the center is soft and fluffy.

It’s the kind of breakfast that makes everyone slow down for a few minutes.

And leftovers are just as useful.

A slice reheated the next morning makes breakfast incredibly easy.

No frying pan.

No pile of dishes.

No standing at the stove.

Just warm up a square and you’re ready to go.

If you’re following a keto or low-carb lifestyle, having recipes like this in your back pocket makes busy mornings so much easier.

But even if you’re not counting carbs, this is simply a delicious breakfast casserole.

It’s cheesy, hearty, savory, and comforting.

And if your family is anything like mine, don’t expect the leftovers to last very long.

Loaded with fluffy eggs, savory sausage, melted cheese, and colorful low-carb vegetables, this Keto Breakfast Casserole is an easy make-ahead breakfast that’s hearty enough to keep everyone satisfied and simple enough to become a regular family favorite. 🥚🧀🥓🥑✨