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Keto Breakfast Casserole 🥘

Cast Iron Keto
by
Updated:
1 Comment
4.50 from 4 votes

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Transform your busy mornings with our delicious Keto Breakfast Casserole! It's low-carb and gluten-free, making it an ideal choice for those on a keto diet. With its fluffy eggs, gooey cheese, and savory sausage all mixed together in a Tex-Mex style, it's a breakfast delight. And the best part? It's so easy to make! Give it a try, and you might just find your new favorite way to start the day. Enjoy!

Keto Breakfast Casserole on a white plate with a fork and a mixture of berries
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Preparation and cooking overview

Preparing this low-carb breakfast casserole is a breeze! Sauté the sausage and veggies over a cast-iron skillet to golden perfection. Then, add the eggs and shredded cheddar cheese to the mix. Put the skillet into the oven and bake. You will enjoy a delicious casserole dish with just 20 minutes of hands-on effort.

Chef's note

If you love Tex-Mex style, serve the casserole with avocado, sour cream, salsa, and hot sauce. Alternatively, you can go Italian and serve it with arugula dressed with lemon and a drizzle of pesto.

  • Prep Time: 10 minutes
  • Cooking Time: 1 hour
  • Total Time: 1 hour and 10 minutes
  • Difficulty Level: Easy
  • Recipe Makes 8 Servings

For more inspiration check out our Breakfast recipe.

🥘 Ingredients for this keto breakfast casserole recipe

Here's a list of ingredients you need to make this keto egg casserole at home:

  • 3 tablespoons avocado oil
  • 12 ounces sugar-free breakfast sausage
  • ¾ cup bell pepper, diced
  • ½ cup onion, diced
  • 1 tomato, diced
  • 1 teaspoon sea salt
  • ½ teaspoon freshly cracked black pepper
  • ½ teaspoon garlic powder
  • 10 large eggs
  • ½ cup heavy cream
  • 1 cup cheddar cheese, shredded

Ingredient substitutions

If you are in for a change, here are a few keto-friendly swaps you can try:

  • Avocado oil: If you don't have avocado oil in your pantry, use an equal amount of coconut oil. It's neutral and is good for sautéing.
  • Heavy cream: For dairy-sensitive people, use coconut cream instead of heavy cream.
  • Shredded cheddar cheese: If you are not a fan of cheddar, swap it with cheeses like mozzarella, pepper jack, or Gouda.
  • Bell pepper: Instead of bell pepper, you can use diced zucchini.

Additional ingredients

Want to add a flair of delicious twists to your keto breakfast? Here are some keto-friendly optional ingredients!

  • Fresh spinach: Sauté baby spinach, along with your other veggies, to provide a lovely pop of color and taste.
  • Mushrooms: Add chopped mushrooms alongside bell pepper and onions for an earthy note and extra texture.
  • Jalapeno peppers: If you're a fan of spice, diced jalapenos are the ideal additions to your casserole.
  • Bacon: Toss some crispy bacon in your casserole dish for a smoky flavor and extra protein punch.
  • Fresh herbs: Sprinkle chopped fresh cilantro or parsley over your cooked casserole to add fresh flavor.
Keto Breakfast Casserole in a cast iron skillet with two white plates and forks sitting beside it.

Cooking tools required

To make this keto breakfast casserole recipe you will need the following tools:

  • 10" cast-iron skillet
  • Wooden spoon
  • Mixing bowl
  • Whisk
  • Knife
  • Cutting board

Tool substitutes list

  • Cast-iron skillet: If you don't have a cast-iron skillet, use a casserole dish or a baking dish that's big enough to accommodate all the ingredients.
  • Whisk: Instead of a whisk, mix the eggs and heavy cream with a fork.

How to make Keto Breakfast Casserole: step-by-step guide

Cooking methods

  • Sautéing
  • Baking

Preparation steps

  1. Gather your ingredients and measure them.
  2. Wash and dry the onions, tomato, and bell pepper. Next, dice them all into even-sized pieces.

Cooking instructions

  1. Preheat your oven to 350°F (180°C).
  2. Heat avocado oil in a 10" cast iron skillet over medium heat.
  3. Once the oil's hot, add the sausage and cook for about 5-7 minutes, crumbling it with the back of your wooden spoon.
  4. Once crumbled, toss in the diced bell pepper, onion, and tomato. Sprinkle sea salt, garlic powder, and freshly cracked black pepper.
  5. Give everything a good stir and let the mixture cook for 3-4 minutes.
  6. As soon as the veggies soften, turn off the heat.
  7. In a medium bowl, whisk the eggs and the heavy cream. Pour the mixture over the sausage mix and stir in shredded cheddar cheese.
  8. Next, transfer the skillet to the preheated oven and bake for 45-50 minutes or until a toothpick inserted in the center comes out clean.
Keto Breakfast Casserole on a white plate with a fork and a mixture of berries

Chef's pro tip

To prevent overcooking the eggs, monitor the casserole closely in the oven. If it starts to brown too fast before setting, gently cover it with foil. Keep in mind that the eggs will continue cooking from the residual heat after being taken out of the oven, so consider removing them slightly earlier.

What to serve with keto breakfast casserole?

Here are some delicious, keto-friendly dishes to pair with our low-carb breakfast recipe:

  • Mixed berries: Serve a small portion of fresh mixed berries like strawberries, blueberries, and raspberries for a sweet contrast. You can also make our Keto Cobbler recipe.
  • Green salad: A refreshing salad complements the heartiness of the casserole perfectly. You can pair it with our Keto Arugula Salad, Keto Greek Salad, or Keto Kale Salad.
  • Keto Cornbread: Serve the casserole with low-carb bread for a classic low-carb casserole experience.

How to make it healthier?

  • The sausage and cheese already contain a lot of sodium, so reduce the additional salt to control your sodium intake.
  • If possible, buy organic eggs, veggies, and dairy products from your local market.

Time-saving tips

  • Use pre-shredded cheese: While freshly shredded cheese is ideal for texture and flavor, using pre-shredded cheese is a big time-saver. Just check the label to ensure there are no added starches.

What can I prepare ahead of time?

  • Sausage mixture: You can cook and store your sausage in the fridge. This makes the cooking process quicker and easier in the morning.
  • Prep ahead: Dice the bell peppers and onions and refrigerate them in an airtight container. This will make your cooking process a breeze.

Storage and reheating instructions

Storage instructions

  • Refrigerator: Slice the casserole into single-serving portions and store them in an airtight container. They will stay fresh and delicious for 4-5 days.
  • Freezer: Cut the leftover casserole into single-serving portions, place them on a sheet pan, and freeze uncovered for 3 hours. Then, transfer them to a freezer-safe bag and store them for up to 2-3 months. Thaw them overnight in the fridge before reheating.

Reheating instructions

  • Microwave: Unwrap a serving of the casserole and place it on a microwave-safe dish. Heat for 1-2 minutes on high or until heated through.
  • Oven: Preheat the oven to 350°F (180°C). Place the casserole on a baking sheet and heat for about 20 minutes until the cheese is hot and bubbly.

Recipe wrap-up conclusion

Our Keto Breakfast Casserole isn't just a morning superstar; the recipe is great for an easy dinner, lunch, and brunch. With just one casserole, you're looking at a whopping 8 servings. Go ahead and double up the magic – you'll have your extended family brunch totally covered with simple ingredients and easy prep!

So next time you want to switch things up from your boring keto diet, try this simple yet tasty casserole. We bet this recipe will be a staple in your routine!

If you like this recipe, here are a few simple keto breakfast recipes for you:

Frequently asked questions

Sure, you can! If you don't like cheddar, choose any cheese that melts well. Monterey Jack or mozzarella are great keto-friendly alternatives.

You can use any breakfast sausage as long as it's sugar-free. It's up to you whether you like your sausage spicy or mild.

For this recipe, you can use any type of tomato you like. A classic choice would be a ripe, juicy beefsteak tomato. You can also use cherry tomatoes or sun-dried tomatoes.

Yes, you can use frozen vegetables in this recipe. Just remember to thaw and drain them well to prevent excess moisture. If you're using frozen onions and peppers, add them directly to the skillet, as they don't need thawing.

If you use this recipe for meal prepping, store the assembled casserole in the fridge for 24 hours. Adding the cheese just before you pop it into the oven is best.

Add some diced jalapeños or a sprinkle of cayenne pepper and smoked paprika. You can even top the finished casserole with some spicy salsa.

📖 Recipe

Keto Breakfast Casserole on a white plate with a fork and a mixture of berries

Keto Breakfast Casserole

This Keto Breakfast Casserole is a great recipe to batch cook for busy mornings! It's low-carb, gluten-free, and super customizable making it perfect for the keto diet.
4.50 from 4 votes
Print Rate Pin Recipe
Course: Breakfast, Main Course
Cuisine: American
Keyword: keto breakfast, keto breakfast casserole, low carb casserole recipe
Prep Time: 10 minutes
Cook Time: 1 hour
Total Time: 1 hour 10 minutes
Servings: 8
Calories: 371kcal

Ingredients

  • 3 tablespoons avocado oil
  • 12 ounces sugar-free breakfast sausage
  • ¾ cup bell pepper diced
  • ½ cup onion diced
  • 1 tomato diced
  • 1 teaspoon sea salt
  • ½ teaspoon freshly cracked black pepper
  • ½ teaspoon garlic powder
  • 10 large eggs
  • ½ cup heavy cream
  • 1 cup cheddar cheese shredded
US Customary - Metric

Instructions

  • Preheat your oven to 350°F (180°C).
  • Heat avocado oil in a 10" cast iron skillet over medium heat.
  • Once the oil's hot, add the sausage and cook for about 5-7 minutes, crumbling it with the back of your wooden spoon.
  • Once crumbled, toss in the diced bell pepper, onion, and tomato. Sprinkle sea salt, garlic powder, and freshly cracked black pepper.
  • Give everything a good stir and let the mixture cook for 3-4 minutes.
  • As soon as the veggies soften, turn off the heat.
  • In a medium bowl, whisk the eggs and the heavy cream. Pour the mixture over the sausage mix and stir in shredded cheddar cheese.
  • Next, transfer the skillet to the preheated oven and bake for 45-50 minutes or until a toothpick inserted in the center comes out clean.

Nutrition

Nutrition Facts
Keto Breakfast Casserole
Amount Per Serving
Calories 371 Calories from Fat 288
% Daily Value*
Fat 32g49%
Saturated Fat 12g75%
Cholesterol 270mg90%
Sodium 734mg32%
Potassium 250mg7%
Carbohydrates 3g1%
Fiber 1g4%
Sugar 1g1%
Protein 17g34%
Vitamin A 1126IU23%
Vitamin C 19mg23%
Calcium 148mg15%
Iron 2mg11%
*

Nutritional values are estimates only and do not include carbs from sugar alcohols.

# Hashtag with us!Don't forget to mention @castiron_keto or tag #castironketo on Instagram with your creations! We love seeing what you're making.
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Reader Interactions

Comments

  1. Eva says

    4 stars
    Awesome flavor and super simple! I feel like we should even throw spinach in here too! We loved this recipe and would totally want to use this as a bake in advance and then freeze and reheat for a quick breakfast on the go!

    Gonna give it our best this first time, but some pro insight for storage and shelf life would be appreciated!!

    Reply
4.50 from 4 votes (3 ratings without comment)

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