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Home Blog Cuisine American

Whole30 Breakfast Casserole with Sausage, Eggs, Spinach, and Mushrooms (Keto)

Cheryl Malik
Cheryl Malik Posted: 03/16/17 Updated: 02/02/23
4.96
/5
121 Comments
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DF Dairy Free GF Gluten Free K Keto LC Low Carb P Paleo 30 Whole30

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Whole30 breakfast casserole with sausage, spinach, and mushrooms in a baking dish

This Whole30 breakfast casserole with sausage, eggs, spinach, and mushrooms is flavorful enough to live off of during a Whole30. You’ll love this healthy, paleo breakfast casserole because it’s packed with flavor, protein, and fiber, making you feel a-freaking-mazing all day. 

Whole30 breakfast casserole with sausage, spinach, and mushrooms in a baking dish

Any time we’re on a Whole30, I spend a couple hours on Sunday afternoon, making dishes for the week. This usually looks like a batch of Whole30 garlic mayonnaise, Whole30 chicken salad, and Whole30 ranch dressing. But one Sunday, I was struck by the strangest, strongest urge to make a sausage and veggie bake, filled with chopped spinach, fresh tomatoes, sautéed mushrooms, homemade spicy breakfast sausage, and fresh herbs.

And you know what? I never tired of eating this Whole30 and paleo breakfast casserole that week, not once! No, I fell in love with the creamy egg bake, the rich sausage, the fresh veggies, the flavorful herbs. This is saying a lot, considering I need a savory breakfast to be absolutely top notch to maintain my attention.

Eggs pouring over Whole30 breakfast casserole with sausage, mushrooms, eggs

Even better, I felt amazing after eating it, which is one of my very favorite things about eating a Whole30 breakfast. There’s no heaviness or energy slump. Nah, you feel light and energized and full until lunch. With loads of veggies and plenty of protein, this Whole30 breakfast casserole with sausage, eggs, spinach, and mushrooms might just be Whole30-perfect.

Why this Whole30 breakfast casserole is so good:

  • It’s the Whole30 breakfast casserole for Whole30 breakfast casserole haters. It’s packed absolutely full of flavor and contains tons of protein.
  • It isn’t heavy, and there’s great fiber content, too. This dish is one where I combined basically everything good I could think of and included all my favorite veggies: sausage, mushrooms, tomatoes. We had fresh basil on hand, so of course I added it. However, you’d be fine without it, or you could substitute dried basil easily.
  • This Whole30 breakfast casserole comes together quite easily, making your Sunday meal prep easier than ever.
Slice of Whole30 breakfast casserole with sausage on a plate with casserole in background

On top of being oh-so-flavorful, it’s super easy and pretty darn quick… major bonus points for anything Whole30, if you know what I mean. The directions go basically as follows: sauté stuff, pour eggs over, bake, um… eat? As much as I freaking love making mayonnaise all the time (liar, liar, pants on fire), I am all about some efficiencies in the kitchen.

Veggies and sausage for Whole30 breakfast casserole

Variations

  • This Whole30 breakfast casserole is super versatile, so you can try it with different meats (Bacon is great!) or veggies. Sun-dried tomatoes would be awesome in this.
  • Increase the eggs to 12 for an eggier paleo breakfast casserole that makes a bit more.
  • Swap out roasted sweet potatoes for the mushrooms if you’re not a fan of fungi.
  • Evenly distribute the veggie filling among the cups in a muffin tin and pour the eggs over for an on-the-go breakfast option.

Tips

  • Don’t overbake this Whole30 breakfast casserole! Cook it until it’s just set and a knife inserted into the center comes out clean.
  • Make sure you squeeze the water out of your thawed spinach, otherwise you’ll end up with a watery mess! If you do forget, just sauté the veggie mixture longer or until the water is evaporated.
Veggies and sausage for Whole30 breakfast casserole

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Hey – you’ve made it this far, so now we’re basically best friends! If you make this recipe, I’d love for you to give it a quick review & star rating ★ below. Make sure you follow me on Instagram, Pinterest, TikTok, and Facebook, too!

Whole30 breakfast casserole with sausage, spinach, and mushrooms in a baking dish
4.96 from 69 votes

Whole30 Breakfast Casserole with Sausage, Eggs, Spinach, and Mushrooms

Prep:15 minutes
Cook:35 minutes
Total:50 minutes
This Whole30 breakfast casserole with sausage, eggs, spinach, and mushrooms is flavorful enough to live off of during a Whole30. You’ll love this healthy, paleo breakfast because it’s packed with flavor, protein, and fiber.
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9 servings

Ingredients

  • 1 pound Whole30-compliant breakfast sausage see below for recipe
  • 3 cups button mushrooms sliced
  • olive oil as needed
  • 6 green onions sliced
  • 3 Roma tomatoes seeded and diced
  • 1 tablespoon fresh basil chopped, or 2 teaspoons dried basil
  • 16 ounces frozen chopped spinach thawed
  • 1 ½ teaspoons salt
  • 10 large eggs

For Homemade Whole30-Compliant Breakfast Sausage

  • 1 pound ground pork
  • 1 teaspoon dried sage
  • 1 teaspoon salt
  • ½ teaspoon ground black pepper
  • 1 pinch dried marjoram
  • 1 pinch crushed red pepper flakes
  • 1 pinch ground cloves

Equipment

  • Large bowl
  • Medium skillet
  • 9×13 baking dish
  • Medium bowl

Instructions 

For the Whole30-Compliant Breakfast Sausage

  • Combine all ingredients in a medium bowl and mix well with your hands. Use in recipe right away or keep in an airtight container for 1 day in the fridge.

For the Whole30 Breakfast Bake

  • Preheat oven to 350º Fahrenheit.
  • In a medium skillet over medium heat, brown and crumble sausage. Add olive oil if necessary.
  • Add mushrooms and cook about 5 minutes or until soft, stirring occasionally. Add remaining vegetables, herbs, and salt and cook about 2 minutes or until slightly softened and well combined. Pour mixture into baking dish.
  • Crack eggs into a medium bowl and whisk well. Pour over sausage-vegetable mixture and bake 25-30 minutes or until a knife, inserted in the center, comes out clean. Serve warm.

Video

Nutrition Information

Serving: 1serving, Calories: 268kcal, Carbohydrates: 5g, Protein: 19g, Fat: 20g, Saturated Fat: 6g, Polyunsaturated Fat: 2g, Monounsaturated Fat: 9g, Trans Fat: 1g, Cholesterol: 243mg, Sodium: 795mg, Potassium: 573mg, Fiber: 2g, Sugar: 2g, Vitamin A: 6491IU, Vitamin C: 8mg, Calcium: 116mg, Iron: 3mg, Net Carbs: 3g

Number of total servings shown is approximate. Actual number of servings will depend on your preferred portion sizes.

 

Nutritional values shown are general guidelines and reflect information for 1 serving using the ingredients listed, not including any optional ingredients. Actual macros may vary slightly depending on specific brands and types of ingredients used.

 

To determine the weight of one serving, prepare the recipe as instructed. Weigh the finished recipe, then divide the weight of the finished recipe (not including the weight of the container the food is in) by the desired number of servings. Result will be the weight of one serving.

© Author: Cheryl Malik

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Cheryl Malik

Meet Cheryl Malik

Cheryl Malik is the recipe developer, writer, and photographer behind the healthy, flavorful, family friendly recipes at 40 Aprons. She's been a blogger for 10+ years and is known for her delicious recipes and detailed recipe instructions. Cheryl is a mom of three who lives in Memphis, TN.

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  1. Michelle says

    Posted on 1/22/23 at 7:33 pm

    Very easy to make and ery delicious5 stars

    Reply
    • Molly | 40 Aprons TeamMolly | 40 Aprons Team says

      Posted on 1/23/23 at 11:13 am

      So glad you enjoyed! Thanks for the review, Michelle!

      Reply
  2. Cristina says

    Posted on 1/5/23 at 11:54 am

    Trying this tonight and so excited about it! How many servings is what is listed in the nutritional information?

    Reply
    • Megan | 40 Aprons TeamMegan | 40 Aprons Team says

      Posted on 1/5/23 at 11:59 am

      The nutritional info is just for 1 serving!

      Reply
      • Kristianne says

        Posted on 2/6/23 at 10:28 am

        I’m trying to figure out how big of a square constitutes a serving size. I cut it into 15 squares.5 stars

      • Megan | 40 Aprons TeamMegan | 40 Aprons Team says

        Posted on 2/6/23 at 11:05 am

        We cut ours into 9 squares!

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