Keto sausage breakfast casserole is the holiday-morning classic without the bread cubes or frozen hash browns. Riced cauliflower gets squeezed dry and baked into a golden base, then topped with browned sausage, peppers, fluffy eggs, and plenty of sharp cheddar.
Each square has 5 g net carbs and 28 g of protein for about 510 calories. Assemble it the night before, then bake in the morning, or bake it on Sunday and reheat all week.
A breakfast this high in protein makes hitting your daily target much easier. My free macro calculator shows you exactly where that target should be.
- 5 g net carbs and 28 g protein per square, about 510 calories.
- Squeeze the cauliflower dry in a clean towel. Wet cauliflower makes a soggy base.
- Pre-bake the base for 15 minutes so it turns golden and firm before the eggs go on.
- Overnight works: assemble, cover, and refrigerate, then add 10 minutes to the bake.
- Rest it 10 minutes after baking so the squares cut cleanly.
Why This Works on Keto
Mornings are when most eating plans fall apart, simply because there’s no time. A casserole that feeds you for a week means the healthy choice is also the fastest one in the fridge.
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Eggs, sausage, and cheddar make every square high in protein and fat and very low in carbs. That combination keeps blood sugar steady and hunger quiet until lunch.
The cauliflower hash brown layer gives the casserole a real foundation and the texture people expect, without the 20 or more grams of carbs that potatoes would add per serving.
A Few Notes on the Ingredients
Cauliflower rice from the freezer section is the easy route. Thaw it, then wring it out hard in a clean kitchen towel. You’ll be surprised how much water comes out.
Italian sausage or breakfast sausage both work. Brown it well and drain off excess fat so the casserole doesn’t turn greasy.
Eggs and heavy cream give a custardy, tender texture. Whisk until the yolks and whites are fully combined so you don’t get streaks of white.
Red bell pepper adds color and sweetness. Dice it small so it softens during baking. Green bell pepper is a touch lower in carbs.
Keto Sausage Breakfast Casserole
Ingredients
Equipment
Method
- Heat the oven to 400°F and grease a 9 by 13 inch baking dish.
- Thaw the cauliflower rice if frozen, then wring it out firmly in a clean kitchen towel. Mix it with 1 egg and the parmesan, and press it evenly into the dish. Bake 15 minutes, until set and lightly golden. Lower the oven to 350°F.
- Meanwhile, brown the sausage in a skillet over medium-high heat, breaking it up, about 8 minutes. Dice the bell pepper and add it for the last 3 minutes. Drain off excess fat.
- Whisk the 12 eggs with the heavy cream, salt, pepper, and garlic powder.
- Scatter the sausage and pepper over the cauliflower base, then sprinkle with 1.5 cups of the cheddar. Pour the egg mixture evenly over the top and finish with the remaining cheddar.
- Bake 35 to 40 minutes, until the center is just set and the top is golden. To make ahead, cover and refrigerate after assembling, then bake 45 to 50 minutes the next morning.
- Rest 10 minutes, sprinkle with green onion, and cut into 8 squares.
Nutrition
Notes
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- Dairy free: Skip the cheddar and use unsweetened almond milk instead of cream. Stir in diced avocado after baking.
- Swap the meat: Crumbled bacon, diced ham, or ground turkey seasoned with sage all work.
- Add greens: Fold 2 cups of baby spinach into the hot sausage so it wilts before layering.
- Change the cheese: Pepper jack adds heat, and Gruyère makes it taste more grown-up.
- Smaller batch: Halve everything and bake in an 8-inch square dish for about 30 minutes.
Storage, Leftovers, and Serving
Cool the casserole, cut it into squares, and refrigerate in a sealed container for up to 5 days. To freeze, wrap squares individually and store up to 2 months.
Reheat a square in the microwave for 60 to 90 seconds, or in a 350°F oven or air fryer for about 8 minutes to crisp the edges. Thaw frozen squares overnight in the fridge first.
Top with hot sauce, salsa verde, or sliced avocado. For more make-ahead mornings, browse my keto breakfast recipes.
Frequently Asked Questions
Can I Make This Breakfast Casserole the Night Before?
Yes. Bake the cauliflower base, let it cool, then layer on the sausage, peppers, eggs, and cheese. Cover and refrigerate overnight. In the morning, bake straight from the fridge and add about 10 minutes to the cooking time.
How Many Carbs Are in Keto Sausage Breakfast Casserole?
Each square has about 5 g net carbs, 28 g protein, and 41 g fat. Swapping hash browns for cauliflower removes the bulk of the carbs a traditional casserole would carry.
Why Is My Breakfast Casserole Watery?
Wet vegetables are almost always the cause. Squeeze the cauliflower very dry, drain the sausage, and pat the peppers dry. Overbaking can also squeeze liquid from eggs, so pull it once the center is just set.
Your This-Week Plan
Here’s the experiment: assemble this on Sunday night, bake it Monday morning, and eat a square for breakfast every weekday. Track how many mornings you would have skipped breakfast or grabbed something on the go. That number shows you what a little prep is worth.
This recipe is for general education, not medical advice. Nutrition values are estimates and will vary with brands. If you’re pregnant, have a health condition, or take medication for blood sugar or blood pressure, check with your doctor before starting keto.
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