Easy Keto Sausage Breakfast Casserole

Breakfast

March 10, 2026

Tired of the same old breakfast routine? Shake things up with this incredibly savory and satisfying Sausage and Veggie Breakfast Casserole! It’s a one-dish wonder, loaded with juicy pork sausage, fresh zucchini, and a rich, cheesy egg custard. Best of all, it comes together in under an hour, making it the perfect fuss-free meal for a lazy weekend brunch or a brilliant make-ahead option for busy weekday mornings. It’s hearty enough to keep you full and focused all day long!

Ingredients

• 1 lb / 450g ground pork sausage
• 2 cups / 300g diced zucchini
• ¼ cup / 40g diced yellow onion
• 2 cups / 140g shredded cabbage
• 3 large eggs
• ½ cup / 115g mayonnaise
• 2 tbsp / 30g Dijon mustard
• 1 tbsp dried ground sage
• 1½ cups / 170g shredded sharp cheddar cheese, divided
• Pinch of cayenne pepper, to taste
• Salt and black pepper, to taste

Instructions

1. Directions
2. Preheat your oven to 375°F / 190°C. Lightly grease a 9×9 inch (or similar 2-quart) casserole dish.
3. In a large skillet over medium-high heat, cook the ground pork sausage, breaking it up with a spoon, until browned. Add the diced zucchini and onion and cook for 5-7 minutes, until tender. Stir in the shredded cabbage and cook for another 2 minutes until it wilts.
4. Drain any excess grease from the skillet and transfer the sausage and vegetable mixture to your prepared casserole dish, spreading it in an even layer.
5. In a medium bowl, whisk together the eggs, mayonnaise, mustard, dried sage, cayenne pepper, salt, and black pepper until smooth and fully combined.
6. Stir 1 cup of the shredded cheddar cheese into the egg mixture.
7. Pour the egg and cheese mixture evenly over the sausage and vegetables in the casserole dish. Sprinkle the remaining ½ cup of cheddar cheese over the top.
8. Bake for 25-30 minutes, or until the center is set, the edges are bubbly, and the cheese on top is golden brown and melted.

Nutritional Information

• Nutritional Info
• Serves 6
• Calories: 480
• Fat: 42g
• Net Carbs: 5g
• Protein: 20g

Pro Tips

• Prepare the casserole the night before (without baking), cover, and refrigerate. Add an extra 5-10 minutes to the baking time when cooking from cold.
• Feel free to swap the veggies! Bell peppers, mushrooms, or spinach would all be delicious additions. Just be sure to cook them down with the sausage first.
• Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat individual portions in the microwave for a quick and easy breakfast.

FAQ

Q: Can I make this breakfast casserole ahead of time
A: Yes, this casserole is perfect for making ahead. You can assemble all the ingredients in the casserole dish the night before, cover, and refrigerate. When you’re ready to cook, you may need to add 5-10 minutes to the baking time.

Q: Is this sausage and veggie breakfast casserole keto-friendly
A: With only 5g of net carbs per serving, this recipe is an excellent choice for a keto or low-carb diet. Ensure you use a sugar-free pork sausage to keep the carb count as low as possible.

Q: What other vegetables can I use in this casserole
A: This recipe is very versatile. You can easily swap the zucchini and cabbage for other low-carb vegetables like bell peppers, mushrooms, or spinach. Just be sure to cook them with the sausage until tender before assembling the casserole.

Q: How do I store and reheat leftovers
A: Store leftover casserole in an airtight container in the refrigerator for up to 4 days. Reheat individual portions in the microwave for a quick and easy breakfast or lunch.

More Keto Recipes

A smiling woman in a green shirt and apron presenting a bowl of roasted vegetables in a bright kitchen.

Potato Breakfast Hash

Preparation Time: 15.0 minutes Cooking Time: 8.0 minutes Serving: 4 Ingredients 2 medium onions, chopped (approx. 1.0 cup, 150g, 5.3 oz) 2 cloves garlic, minced (approx. 10g, 0.35 oz) 2 large sweet potatoes, diced into 1-inch pieces (approx. 3.0 cups, 450g, 16.0 oz) 2...

Woman in a striped apron offers a bowl of roasted potatoes garnished with chives in a bright kitchen.

Breakfast Potatoes 

Ingredients 4 gold potatoes, washed and peeled (approx. 24 oz / 680g) Water as needed (approx. 1.0 cup / 8 fl oz / 240ml) 1.0 tbsp. (0.5 oz / 14g) bacon fat or butter 2.0 tsp. (0.1 oz / 3g) Italian seasoning 0.5 tsp. (0.1 oz / 3g) salt, plus pepper to taste 1.0 cup...

A smiling woman in an apron holding a white plate of golden-brown pan-seared Mahi-Mahi cakes garnished with fresh chives, parsley, and lemon wedges in a bright, modern kitchen.

Easy Keto Mahi-Mahi Cakes (Quick & Crispy!)

Craving a meal that feels a little fancy without the fuss? These Golden Mahi-Mahi Cakes are your new weeknight hero! They’re the perfect answer when you want something light, satisfying, and incredibly fast. Using just a few pantry staples, we’ll transform...

Woman holding a rustic platter of golden-brown low carb broccoli and cheese fritters with creamy dill dipping sauce.

Crispy Keto Broccoli and Cheese Fritters

Craving a savory, cheesy snack that won’t compromise your health goals? These Low Carb Broccoli and Cheese Fritters are the answer. We’ve transformed simple broccoli into golden-brown bites of comfort food, packed with gooey mozzarella and a satisfyingly...

A woman holding a warm bowl of vegan keto porridge topped with fresh berries, nuts, and seeds in a bright kitchen.

5-Minute Keto Vegan Porridge (High-Protein)

Missing a warm, comforting bowl of oatmeal on your keto or vegan diet? This 5-minute porridge is the answer! It’s incredibly creamy, packed with protein, and completely grain-free, making it the perfect guilt-free breakfast to fuel your morning. Say goodbye to...

Woman holding a warm bowl of Tofu Scramble with cherry tomatoes and spinach.

Easy Tofu Scramble (12-Minute Vegan Breakfast)

Let’s be real—mornings are a battle between the snooze button and the need for a decent meal. As a firm member of ‘team snooze,’ I need breakfasts that are fast, fueling, and practically make themselves. Enter my weekday savior: this incredible Tofu...

A close-up photograph of a woman holding a plate of "The Quick Scramble," a hearty breakfast dish featuring fluffy scrambled eggs loaded with sautéed spinach, sliced baby bella mushrooms, diced ham, and red bell peppers.

The Ultimate 10-Minute High-Protein Egg Scramble

Let’s be real—mornings are a mad dash. Between hitting snooze one too many times and rushing out the door, a proper breakfast can feel like a fantasy. That’s where my Quick Scramble comes in. It’s my secret weapon for those days I need serious fuel...

Steaming bowl of Warm Asian Broccoli Salad, featuring creamy broccoli slaw, sesame seeds, and cilantro, held in a pair of hands in a rustic kitchen setting.

Warm Asian Broccoli Salad (15-Min Keto Breakfast)

I used to think eating veggies first thing in the morning was a struggle, but this recipe completely changed my mind. There is something incredibly comforting about a savory, warm bowl to start the day, especially when it takes less than 15 minutes to throw together....

A woman in a cozy sweater holding a ceramic mug containing a freshly cooked Sun-Dried Tomato Pesto Mug Cake garnished with basil.

Keto Sun-Dried Tomato Pesto Mug Cake (2-Minute Recipe)

Craving a savory, satisfying breakfast but short on time? This Sun-Dried Tomato Pesto Mug Cake is your morning-saver! It’s a warm, fluffy, café-style treat that comes together in your microwave in just two minutes. Say goodbye to a pile of dishes and hello to a...

A smiling woman in a green shirt and apron presenting a bowl of roasted vegetables in a bright kitchen.

Potato Breakfast Hash

Preparation Time: 15.0 minutes Cooking Time: 8.0 minutes Serving: 4 Ingredients 2 medium onions, chopped (approx. 1.0 cup, 150g, 5.3 oz) 2 cloves garlic, minced (approx. 10g, 0.35 oz) 2 large sweet potatoes, diced into 1-inch pieces (approx. 3.0 cups, 450g, 16.0 oz) 2...

Woman in a striped apron offers a bowl of roasted potatoes garnished with chives in a bright kitchen.

Breakfast Potatoes 

Ingredients 4 gold potatoes, washed and peeled (approx. 24 oz / 680g) Water as needed (approx. 1.0 cup / 8 fl oz / 240ml) 1.0 tbsp. (0.5 oz / 14g) bacon fat or butter 2.0 tsp. (0.1 oz / 3g) Italian seasoning 0.5 tsp. (0.1 oz / 3g) salt, plus pepper to taste 1.0 cup...

A smiling woman in an apron holding a white plate of golden-brown pan-seared Mahi-Mahi cakes garnished with fresh chives, parsley, and lemon wedges in a bright, modern kitchen.

Easy Keto Mahi-Mahi Cakes (Quick & Crispy!)

Craving a meal that feels a little fancy without the fuss? These Golden Mahi-Mahi Cakes are your new weeknight hero! They’re the perfect answer when you want something light, satisfying, and incredibly fast. Using just a few pantry staples, we’ll transform...

Woman holding a rustic platter of golden-brown low carb broccoli and cheese fritters with creamy dill dipping sauce.

Crispy Keto Broccoli and Cheese Fritters

Craving a savory, cheesy snack that won’t compromise your health goals? These Low Carb Broccoli and Cheese Fritters are the answer. We’ve transformed simple broccoli into golden-brown bites of comfort food, packed with gooey mozzarella and a satisfyingly...

0
Would love your thoughts, please comment.x
()
x
0