This low carb breakfast casserole is the kind of meal that makes mornings easier. It’s hearty, satisfying, and loaded with protein and vegetables, so you feel full without the mid-morning crash. You can make it ahead, reheat it fast, and feed a crowd or just yourself for several days.
The flavors are warm and savory, and the texture is soft with a little golden crust on top. If you want a simple, wholesome breakfast that actually tastes great, this one delivers.
Low Carb Breakfast Casserole: Healthy & Filling Start to Your Day
Ingredients
- 10 large eggs
- 1 cup shredded cheddar (or a blend like cheddar and mozzarella)
- 1/2 cup cottage cheese or ricotta for extra creaminess
- 1/2 cup heavy cream (or unsweetened almond milk to lighten it)
- 12 oz breakfast sausage (pork or turkey), casings removed
- 1 cup broccoli florets, chopped small
- 1 cup bell peppers, diced (any color)
- 1/2 medium onion, diced
- 2 cloves garlic, minced
- 1 cup baby spinach, roughly chopped
- 2 tbsp olive oil or avocado oil
- 1 tsp kosher salt, divided (adjust to taste)
- 1/2 tsp black pepper
- 1/2 tsp smoked paprika (optional)
- 1/4 tsp red pepper flakes (optional for mild heat)
- Fresh herbs like chives or parsley for topping (optional)
Instructions
- Preheat and prep: Heat the oven to 375°F (190°C). Grease a 9x13-inch baking dish with oil or cooking spray.
- Cook the sausage: Warm 1 tablespoon oil in a skillet over medium heat. Add the sausage and break it up as it cooks. Brown until no longer pink, about 6–8 minutes. Transfer to a paper towel–lined plate.
- Sauté the vegetables: In the same pan, add the remaining oil, onion, and peppers. Cook until they soften, 4–5 minutes. Add broccoli and a pinch of salt and cook 2–3 minutes more. Stir in garlic for the last 30 seconds. Fold in spinach just to wilt. Remove from heat.
- Whisk the custard: In a large bowl, whisk eggs, heavy cream, and cottage cheese until smooth. Season with remaining salt, pepper, smoked paprika, and red pepper flakes if using.
- Assemble: Spread the cooked sausage evenly in the baking dish. Top with the sautéed vegetables. Pour the egg mixture over everything and sprinkle cheese on top.
- Bake: Place the dish on the center rack and bake for 28–35 minutes, until the center is just set and the top is lightly golden. A knife inserted near the center should come out mostly clean.
- Rest and serve: Let it rest 5–10 minutes before slicing. Top with fresh herbs if you like.
Why This Recipe Works
- High protein, low carb: Eggs, cheese, and sausage or turkey give you staying power without the carb overload.
- Make-ahead friendly: Assemble it the night before or bake once and enjoy easy slices all week.
- Flexible base: Swap veggies, meats, and cheeses to fit what you have and what you like.
- Simple method: A few bowls, one baking dish, and straightforward steps keep it stress-free.
- Kid and crowd-friendly: Familiar flavors with room for spice if you want it.
Ingredients
- 10 large eggs
- 1 cup shredded cheddar (or a blend like cheddar and mozzarella)
- 1/2 cup cottage cheese or ricotta for extra creaminess
- 1/2 cup heavy cream (or unsweetened almond milk to lighten it)
- 12 oz breakfast sausage (pork or turkey), casings removed
- 1 cup broccoli florets, chopped small
- 1 cup bell peppers, diced (any color)
- 1/2 medium onion, diced
- 2 cloves garlic, minced
- 1 cup baby spinach, roughly chopped
- 2 tbsp olive oil or avocado oil
- 1 tsp kosher salt, divided (adjust to taste)
- 1/2 tsp black pepper
- 1/2 tsp smoked paprika (optional)
- 1/4 tsp red pepper flakes (optional for mild heat)
- Fresh herbs like chives or parsley for topping (optional)
How to Make It
- Preheat and prep: Heat the oven to 375°F (190°C). Grease a 9×13-inch baking dish with oil or cooking spray.
- Cook the sausage: Warm 1 tablespoon oil in a skillet over medium heat.
Add the sausage and break it up as it cooks. Brown until no longer pink, about 6–8 minutes. Transfer to a paper towel–lined plate.
- Sauté the vegetables: In the same pan, add the remaining oil, onion, and peppers.
Cook until they soften, 4–5 minutes. Add broccoli and a pinch of salt and cook 2–3 minutes more. Stir in garlic for the last 30 seconds.
Fold in spinach just to wilt. Remove from heat.
- Whisk the custard: In a large bowl, whisk eggs, heavy cream, and cottage cheese until smooth. Season with remaining salt, pepper, smoked paprika, and red pepper flakes if using.
- Assemble: Spread the cooked sausage evenly in the baking dish.
Top with the sautéed vegetables. Pour the egg mixture over everything and sprinkle cheese on top.
- Bake: Place the dish on the center rack and bake for 28–35 minutes, until the center is just set and the top is lightly golden. A knife inserted near the center should come out mostly clean.
- Rest and serve: Let it rest 5–10 minutes before slicing.
Top with fresh herbs if you like.
How to Store
- Refrigerator: Cool completely, then cover or store slices in airtight containers for up to 4 days.
- Freezer: Wrap individual portions tightly, then place in a freezer bag. Freeze up to 2 months. Thaw overnight in the fridge.
- Reheat: Microwave slices 60–90 seconds, or bake at 325°F (165°C) for 10–15 minutes until hot.
- Meal prep tip: Cut into single-serve squares for grab-and-go breakfasts.
Why This is Good for You
- Steady energy: The protein and fat from eggs, sausage, and cheese help keep blood sugar stable, which can reduce cravings later.
- Veggie boost: Broccoli, peppers, spinach, and onion add fiber, vitamins A, C, K, and a range of minerals with very few carbs.
- Low carb, not low flavor: Seasonings, cheese, and a good sear on the sausage build rich taste without relying on bread or potatoes.
- Customizable nutrition: You can lighten it with turkey sausage and almond milk or make it richer with full-fat dairy, depending on your goals.
Common Mistakes to Avoid
- Skipping the sauté: Raw veggies release water and can make the casserole watery.
Always cook them first.
- Overbaking: It turns dry and rubbery fast. Pull it when the center is just set and let carryover heat finish the job.
- Not seasoning enough: Eggs need salt. Taste the veggies and sausage as you go and season the egg mixture well.
- Using the wrong pan size: Too small and it takes forever to set; too large and it dries out.
A 9×13 dish is the sweet spot.
- Cutting too soon: A short rest keeps the slices neat and helps the custard set fully.
Recipe Variations
- Greek-style: Use feta, chopped spinach, red onion, olives, and oregano. Swap sausage for cooked chicken or turkey.
- Southwest: Add green chiles, pepper jack cheese, cilantro, and a dash of cumin. Serve with salsa or avocado.
- Veggie-forward: Skip the sausage and add mushrooms, zucchini, and extra spinach.
Include a bit more cheese for protein.
- Bacon and leek: Crisp bacon, sauté sliced leeks in the rendered fat, and use Gruyère for a smoky, velvety finish.
- Dairy-light: Use almond milk, skip cottage cheese, and choose a smaller amount of a strong cheese like aged cheddar.
- Spicy chorizo: Swap in fresh chorizo and add a pinch of chili powder. Balance with Monterey Jack.
FAQ
Can I make this the night before?
Yes. Assemble the casserole, cover, and refrigerate overnight.
Add 5–10 minutes to the bake time since it will be cold going into the oven.
What can I use instead of sausage?
Ground turkey, chicken, bacon, or diced ham all work. For a vegetarian version, try crumbled tofu sautéed with spices or a plant-based sausage.
How do I prevent a watery casserole?
Sauté vegetables to cook off moisture, drain excess fat from the meat, and avoid overloading with high-water veggies like tomatoes or zucchini unless you pre-cook them well.
Is this keto-friendly?
Yes. It’s naturally low in carbs and high in fat and protein.
Use full-fat dairy and check your sausage ingredients for added sugars to keep it keto.
Can I use egg whites instead of whole eggs?
You can, but the texture will be lighter and less rich. Use about 1 1/2 cups egg whites plus 4 whole eggs to keep some creaminess and structure.
What size baking dish works best?
A 9×13-inch dish is ideal. If you use an 8×8, reduce the ingredient amounts or increase the bake time because the casserole will be thicker.
How do I know when it’s done?
The center should be set but still slightly jiggly, and the top lightly golden.
A knife inserted near the center should come out mostly clean with no runny egg.
Can I add potatoes or bread?
You can, but it will no longer be low carb. If you want more bulk while keeping carbs lower, add extra non-starchy vegetables or cooked mushrooms.
Final Thoughts
A good breakfast should be easy, nourishing, and satisfying, and this low carb breakfast casserole checks all the boxes. It fits busy mornings, supports steady energy, and tastes great for days.
Keep the base recipe handy, then tweak the mix-ins to match your cravings or what’s in your fridge. With a little prep, you’ll have a warm, reliable start to your day every time.
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