We first made this recipe on a hectic Sunday morning, hoping for something quick, hearty, and satisfying enough to fuel the day. It became an instant family favorite! This dish combines wholesome ingredients like cauliflower, eggs, and cheese into a comforting bake that’s simple to prepare and delicious from the very first bite. Whether you’re meal prepping for the week or serving brunch guests, this keto breakfast casserole is a winner all around.

Why You’ll Love This Keto Breakfast Casserole

This casserole isn’t just another low-carb breakfast option. It’s a flavorful, nutrient-packed dish that checks all the boxes:

Low-carb and keto-friendly: Packed with protein and healthy fats while skipping the carbs.
Make-ahead convenience: Perfect for busy mornings or meal prep routines.
Customizable: Swap in your favorite veggies, proteins, or seasonings to make it your own.
Cheesy perfection: The blend of cottage cheese and shredded cheese adds a creamy, savory touch in every bite.

And because this recipe features cauliflower instead of starchier ingredients, it’s a great option if you’re looking for a lighter, veggie-rich start to your day.

Key Nutrition Benefits

This low-carb breakfast casserole brings a variety of nutritional benefits to the table:

Cauliflower: A versatile vegetable that’s low in carbs and rich in fiber, vitamin C, and antioxidants. It helps keep you full while supporting healthy digestion.
Eggs: Eggs are a powerhouse of protein, providing essential amino acids along with vitamins D and B12.
Cottage cheese: A great source of protein and calcium, which are important for muscle repair, bone health, and overall wellness.
Bell peppers: Loaded with vitamin C, antioxidants, and fiber, bell peppers add a sweet crunch and vibrant flavor.

Combined, these ingredients create a dish that’s both nourishing and energizing, perfect for starting the day strong.

Recipe Information

Cuisine: American
Servings: 6 servings
Prep Time: 5 minutes
Cook Time: 40 minutes
Total Time: 45 minutes

Ingredients You’ll Need

Before you get started, make sure to gather these ingredients. They’re simple yet come together beautifully in this dish:

1 pound cauliflower, cooked (steamed or air-fried)
1 large bell pepper, chopped
1 large onion, chopped
1/4 pound Italian sausage, chopped
6 large eggs
4 large egg whites (or replace with 2 extra whole eggs)
1 cup cottage cheese
1 1/2 cups shredded cheese (Mozzarella or cheddar works best)
1 teaspoon salt
1 teaspoon pepper

How to Make This Low-Carb Breakfast Casserole

Follow these simple steps to create a cheesy, delicious breakfast casserole you’ll want to make again and again:

Preheat and prepare: Preheat your oven to 350°F (180°C). Grease a 9 x 13-inch baking dish and set it aside.
Cook the sausage and veggies: Heat oil in a skillet over medium heat. Add the onions, bell pepper, and Italian sausage. Cook for 3–4 minutes until the sausage is browned.
Assemble the casserole: Spread the cauliflower, cooked vegetables, and sausage evenly across the baking dish.
Whisk the egg mixture: In a mixing bowl, whisk together the eggs, egg whites, cottage cheese, shredded cheese, salt, and pepper until well combined.
Pour and bake: Pour the egg mixture over the ingredients in the baking dish. Bake for 35–40 minutes until the center is set and the edges turn golden brown.
Serve: Let the casserole cool for a few minutes before slicing. Serve immediately, or allow it to cool completely for make-ahead meals.

Pro Tips from Our Test Kitchen

Here are our favorite tips for making this casserole the best it can be:

Make it mini: For individual servings, use a greased muffin tin instead of a baking dish. Bake for 25–30 minutes.
Veggie swaps: Try spinach, mushrooms, diced tomatoes, or green onions. Cook them before adding to the casserole to prevent extra moisture.
Boost the protein: Add cooked bacon, diced ham, smoked salmon, or ground pork for variety and extra flavor.
Reheating tip: For leftovers, reheat in the microwave for a quick breakfast during the week.

Variations and Storage Tips

This dish is easy to customize and stores beautifully:

Customize it! Experiment with your favorite seasonings like garlic powder, onion powder, or a dash of hot sauce for a spicy twist.

Storing leftovers: Refrigerate for up to 1 week in an airtight container, or freeze for up to 6 months. Thaw overnight in the fridge before reheating.

Reheat for perfection: Warm in the microwave or oven for best results. If reheated in the oven, cover with foil to prevent drying out.

Nutrition Facts

Here’s what you’ll get in one serving (approximate, based on standard ingredients):

Calories: 240
Protein: 17g
Fat: 14g
Carbohydrates: 5g
Fiber: 2g

This nutrient profile makes it a fantastic option for any keto or low-carb plan.

Frequently Asked Questions

Can I make this ahead of time?

Absolutely! Prepare the casserole, bake it, and store covered in the fridge. Reheat in the oven or microwave when ready to serve.

Can I skip the cauliflower?

If you’re not a fan of cauliflower, you can replace it with cooked broccoli or omit it entirely, though the texture may change slightly.

What’s the best cheese to use?

Mozzarella and cheddar are both delicious choices. Feel free to mix for a unique flavor profile!

How do I make this dairy-free?

Substitute the cottage cheese with a dairy-free alternative, and use shredded dairy-free cheese instead of mozzarella or cheddar.

Let’s Get Cooking!

We hope this keto breakfast casserole becomes a go-to recipe in your kitchen, just as it has in ours. It’s perfect for busy mornings, lazy weekends, or even a quick dinner option. Give it a try, and let us know how it turned out! Don’t forget to share your creation on social media and tag us at Simply Nourished Life. Looking for more low-carb breakfast options? Check out our other healthy and delicious recipes!