This Sausage and Peppers Breakfast Casserole is a hearty, cheesy dish that’s packed with bold flavors. With layers of savory sausage, tender veggies, and creamy eggs, it’s perfect for a filling and satisfying healthy breakfast.

❤️ Why You’ll Love This Breakfast Casserole Recipe

• Savory Italian sausage
• Sweet red bell pepper and onions
• Blend of Italian cheeses
• Baked in fluffy eggs
• Perfect for breakfast meal prepping

Breakfast is the most important meal of the day and this Sausage and Peppers Breakfast Casserole is a delicious way to kick things off. Made with flavorful Italian sausage, vibrant red bell peppers, and creamy cheese, this dish adds a whole lot of flavors to your morning routine.

Perfect for feeding a crowd or meal prepping for the week ahead, this casserole is as simple to make as it is tasty. Just layer the ingredients, pop it in the oven, and you’ll have a hearty and delicious breakfast that everyone will love, making those busy mornings a breeze!

Breakfast casseroles are awesome for the holidays, brunch showers or anytime you need to feed a crowd. For another popular recipe, check out this Easy Keto Casserole.

🛒 Ingredients for Sausage Breakfast Casserole

• Eggs
• Italian sausage
• Red bell pepper
• Onion
• Heavy cream
• Cream cheese
• Parsley
• Butter
• Garlic salt
• Salt
• Ground black pepper

*Exact measurements are listed in the recipe card below.

🥣 Recommended Tools

• Skillet
• Mixing bowl
• Whisk
• 9 x 13 casserole baking dish

🔪 How to Make Keto Breakfast Casserole

Preheat oven to 350°F.

Preheat oven to 350°F. Add the ground sausage to a skillet and brown it, then remove and set it aside to cool.

In the same skillet (leaving behind any fat) add in the butter, red bell pepper, onion, salt and half the ground black pepper. 

Sauté until tender, then set aside to cool.

Add the eggs, heavy cream, garlic salt and remaining ground black pepper in a mixing bowl.  Whisk until well combined.

Pour half the eggs into a 9 X 13 casserole baking dish that’s been sprayed with olive oil. Add half the sausage, peppers, onions, shredded cheese and the cream cheese in small dollops, all evenly distributed.

Repeat with the remaining ingredients, ending with the shredded cheese over the top.

Bake for 30 minutes or until the eggs have set.  

Allow to cool before cutting into. Store leftovers in the fridge for up to a few days

☑️ Storage Instructions

Fridge: Allow the casserole to cool completely before storing. Cover it tightly with plastic wrap or transfer it to an airtight container. Store in the fridge for up to 3-4 days.

Freezer: For longer storage, cut the casserole into individual portions after it has cooled. Wrap each portion tightly in plastic wrap or place them in airtight freezer bags. Label with the date and freeze for up to 2-3 months.

Reheating: To reheat, thaw in the fridge overnight and bake in the oven until heated through, or microwave until warm.

🍴 What to Serve with Keto Breakfast Casserole

This is a hearty breakfast casserole that is delicious all on it’s own. But, a side of fresh berries or a toasted homemade Keto Bagel are always great additions.

💡 Tips for a Making Breakfast Casserole

• With this recipe, you’ll get little pockets of cream cheese in every bite. If you prefer it blended in, you may want to melt it in the microwave and let it cool before mixing it in with the other ingredients.

• After baking, allow the casserole to rest for about 10 minutes before slicing. This helps the eggs set further, making it easier to cut clean pieces.

• Start checking the casserole a few minutes before the suggested baking time. Ovens can vary, and you want to ensure it doesn’t overcook.

🔄 Substitutions and Additions

• Sausage: Swap Italian sausage for turkey sausage or chicken sausage for a different protein option.

• Cheese: Substitute the Italian blend cheese with cheddar, Monterey Jack, or mozzarella.

• Cream cheese: You can replace the cream cheese with ricotta or cottage cheese.

• Bell pepper: Substitute the red bell pepper with green bell pepper, yellow bell pepper, or even roasted red peppers for a different flavor.

• Onion: Replace yellow onion with shallots or green onions for a milder taste.

• Vegetables: Add spinach, zucchini, or mushrooms for extra nutrition and flavor.

• Toppings: Top the casserole with avocado slices, a dollop of homemade Guacamole, or Salsa after baking for a fresh touch.

• Hot sauce: Serve it with hot sauce on the side for those who like a bit of spice.

Keto Breakfast Casserole FAQs

Can I Freeze Leftover Keto Breakfast Casserole?

This recipes freezes beautifully. Just portion it out and place it in individual freezer safe containers. When you’re ready to serve, thaw in the fridge over night, then reheat in the oven on 350F or you can even reheat it in the microwave.

Do I Have to Precook the Meat Before Adding it to This Low Carb Casserole?

It is recommended that you use precooked meat in this recipe because the eggs cook rather quickly in the oven which would not allow enough time for your meat to properly cook.

Can I Make This Breakfast Casserole the Night Before?

You have a couple of choices here. You can cook the sausage, chop the peppers and shred the cheese the night before, then the next morning just mix up the eggs and spices and bake. Or, because this casserole is excellent for reheating, you can cook the casserole the night before then reheat it in serving sizes.

Why is My Casserole Soggy?

A soggy casserole may result from excess moisture in the vegetables or not allowing the cooked sausage and veggies to cool before mixing them with the eggs. To prevent this, make sure to sauté the vegetables until they are tender and any liquid has evaporated. Allow the mixture to cool slightly before combining it with the egg mixture.

🍽️ More Keto Casseroles

• Chicken Parmesan Casseroles
• Loaded Creamy Cauliflower Casserole
• Chicken Cordon Bleu Casserole
• Chicken Broccoli Casserole
• Chicken Florentine Casserole
• Chicken Alfredo Casserole

*Originally published on August 27, 2018, updated on November 8, 2024 with improvements to the recipe, new photos, new recipe information and helpful tips.