Easy Whole30 Breakfast Casserole

By:

janvier 23, 2026

Easy Whole30 Breakfast Casserole with vegetables and herbs in a baking dish

Easy Whole30 Breakfast Casserole for Cozy Mornings

It’s one of those bright Sunday mornings when the smell of something delicious wafts through the kitchen, filling the air with warmth and promise. As the sunlight streams through the window, I can already envision the happy chatter of my family as they gather around the table, savoring every bite of a hearty breakfast. Today, this mouthwatering Whole30 Breakfast Casserole is the star of the show — it’s the kind of dish that brings comfort and joy, offering a delightful start to the weekend.

This breakfast casserole is more than just a dish; it’s a celebration of simple ingredients that come together beautifully. Packed with vibrant vegetables, fluffy eggs, and flavorful sausage, this recipe is a fantastic way to kick off your day. So, grab your mixing bowl and let’s dive into creating something truly special.

Why You’ll Love This Recipe

This Whole30 Breakfast Casserole checks all the boxes: it’s easy to make, incredibly delicious, and can be customized to your family’s tastes. Not only is it a perfect way to use up leftover vegetables, but it also encourages everyone to enjoy a wholesome, nutritious start to the day. Plus, the beauty of a casserole is that it can be prepared ahead of time, making busy mornings a breeze!

Imagine slicing into a golden, fluffy piece, where each forkful brings the savory notes of sausage complemented by the vibrant crunch of bell peppers and the earthiness of spinach. It’s a warm hug in every bite, perfect for families and anyone looking to nourish their body without fuss.

Ingredients for Whole30 Breakfast Casserole

To whip up this scrumptious breakfast, gather the following ingredients:

  • 1 pound Whole30 approved breakfast sausage (or turkey sausage if not Whole30)
  • Olive oil for the pan
  • 1 white or yellow onion, diced
  • 1 green bell pepper, diced
  • 1 red bell pepper, diced
  • 2 cups fresh spinach, chopped (or 16 ounces frozen, thawed and drained)
  • ½ teaspoon garlic powder
  • 1 teaspoon salt-free Mrs. Dash Onion & Herb Seasoning, plus a sprinkle for the top
  • Salt and pepper, to taste
  • 12 large eggs
  • Hot sauce (optional, to taste)

Sausage and Egg Whole30 Breakfast Casserole

Ingredient Notes

  • Sausage: Feel free to swap out the breakfast sausage for a chicken or beef variety if you prefer. Just make sure it’s Whole30 compliant if you’re following that plan!
  • Veggies: This recipe is wonderfully versatile — you can easily add in other vegetables like zucchini, mushrooms, or kale.
  • Seasonings: If you don’t have Mrs. Dash, a mix of dried herbs like oregano, thyme, and basil will work wonderfully.
  • Eggs: Using organic eggs not only enhances flavor but also provides a nutritional boost.

How to Make It

Step 1 – Prep the Veggies

Preheat your oven to 350 degrees F (175 degrees C). While it’s heating up, take a moment to dice the peppers and onion, and chop the spinach. Set them aside; the colorful medley will add a delightful crunch and nutrition to our casserole.

Step 2 – Cook the Sausage

In a large skillet over medium-high heat, drizzle in a little olive oil to coat the bottom. Add the sausage to the pan, breaking it up with your spatula. Sauté until it’s fully cooked and no longer pink, which should take about 5-7 minutes. Once done, drain any excess fat and set the sausage aside.

Step 3 – Sauté the Veggies

In the same skillet, add a touch more olive oil if needed, then toss in your diced onion, green, and red bell peppers. Cook them for about 2-3 minutes until they start to soften. Next, add in the chopped spinach and cook just for another minute, letting it wilt. Remove the skillet from the heat.

Now, return the cooked sausage to the skillet, sprinkle in the garlic powder, Mrs. Dash seasoning, salt, and pepper. Stir everything until well combined before preparing to bake.

In a glass 9×13 baking dish that has been sprayed with non-stick olive oil, pour the sausage and veggie mixture evenly across the bottom. In a medium bowl, crack all 12 eggs and whisk them until they’re frothy. If desired, whisk in a couple of drops of hot sauce for a little kick.

Pour the egg mixture over the sausage and veggies, allowing it to seep into every nook and cranny. Finish by sprinkling a touch of Mrs. Dash on top for an enticing aroma as it bakes.

Bake for 25-30 minutes or until the egg is set and a knife comes out clean from the center. Let it cool for about 5-10 minutes before slicing into squares to serve. If you’re feeling extra festive, top with a splash of salsa for a delightful zing!

Tips for Success

  • Prepping Ahead: You can make this breakfast casserole the night before. Simply assemble it, cover it, and refrigerate until you’re ready to bake in the morning.
  • Cooking Times: Keep an eye on your oven, as baking times can vary slightly based on your dish and oven configuration. It’s always best to test with a knife!
  • Serve It Warm: This casserole is best enjoyed warm, but if you have leftovers, they store beautifully in the fridge for quick reheating during the week.

Recipe Variations

Here are some creative ways to twist this casserole to fit your taste or whatever you have on hand:

  1. Veggie-Loaded: Add nutritional power by incorporating mushrooms, zucchini, or shredded carrots into the mix.
  2. Herby Delight: Toss in fresh herbs like basil, parsley, or cilantro for added flavor and freshness.
  3. Cheesy Version: If you’re not following Whole30 but still want a crowd-pleaser, sprinkle some shredded cheese on top right before baking.
  4. Spicy Kick: For those who love heat, use spicy sausage or add sliced jalapeños to the sauté.
  5. Mediterranean Style: Swap in diced tomatoes, black olives, and oregano to give it a taste of the Mediterranean.

Easy Whole30 Breakfast Casserole

Serving Ideas

This Whole30 Breakfast Casserole works wonderfully as a stand-alone dish, but it also pairs beautifully with a side of fresh fruit. You can serve it with a simple mixed green salad drizzled with olive oil and lemon for a refreshing contrast. For a heartier meal, add avocado slices or a dollop of guacamole to each serving.

Storage and Freezing

Leftover casserole can be stored in an airtight container in the fridge for up to 4-5 days. Simply reheat in the microwave or oven until warmed through. If you’d like to freeze it, do so before baking; wrap it tightly in plastic wrap and then foil. It can be frozen for up to 3 months. When ready to enjoy, thaw it in the fridge overnight and bake as directed.

Nutrition Facts (per serving)

| Nutrient | Value | |————-|———–| | Calories | 230 | | Protein | 18g | | Carbs | 8g | | Fat | 14g | | Fiber | 2g | | Sodium | 400mg |

FAQ About Whole30 Breakfast Casserole

Can I make this breakfast casserole ahead of time?

Absolutely! You can assemble it the night before and refrigerate it until you’re ready to bake the next morning. It’s a huge time saver, especially on busy mornings!

What can I substitute for the sausage?

If you’re looking for alternatives, you can swap the sausage for chicken or beef. Just keep in mind that if using something like turkey, you may need to adjust the cooking time slightly.

Is this recipe dairy-free?

Yes, this Whole30 Breakfast Casserole is dairy-free! It relies purely on whole foods without adding any dairy products.

Can I customize the vegetables used in this recipe?

Definitely! This recipe is incredibly flexible. Feel free to mix in your favorite veggies or use whatever you have on hand. Just ensure they are pre-cooked if they need longer cooking times.

How can I store leftovers?

Leftovers can be stored in an airtight container in the fridge for about 4-5 days. For longer storage, you can also freeze it before baking. Just remember to thaw it overnight before baking.

In a Few Words

Cooking is about sharing moments, feeding not just our bodies but our souls. This Whole30 Breakfast Casserole embodies that spirit. It’s a simple, delightful dish that nourishes us while wrapping us in warmth, reminding us of breakfast gatherings with loved ones. With every bite, you’ll taste the love that went into it, making mornings all the more special.

Conclusion

As you gather with your family around the breakfast table, this Whole30 Breakfast Casserole will undoubtedly bring smiles and playful chatter. With its rich flavors and simple ingredients, it’s a recipe you’ll find yourself making again and again, whether it’s a lazy weekend brunch or a busy weekday morning. Here’s to cozy moments, delicious meals, and the joy of cooking together!

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Easy Whole30 Breakfast Casserole for Cozy Mornings


  • Author: emilie
  • Total Time: 45 minutes
  • Yield: 6 servings 1x
  • Diet: Whole30, Gluten-Free, Dairy-Free

Description

A hearty and delicious Whole30 Breakfast Casserole featuring vibrant vegetables, fluffy eggs, and flavorful sausage, perfect for a cozy family gathering.


Ingredients

Scale
  • 1 pound Whole30 approved breakfast sausage (or turkey sausage if not Whole30)
  • Olive oil for the pan
  • 1 white or yellow onion, diced
  • 1 green bell pepper, diced
  • 1 red bell pepper, diced
  • 2 cups fresh spinach, chopped (or 16 ounces frozen, thawed and drained)
  • ½ teaspoon garlic powder
  • 1 teaspoon salt-free Mrs. Dash Onion & Herb Seasoning, plus a sprinkle for the top
  • Salt and pepper, to taste
  • 12 large eggs
  • Hot sauce (optional, to taste)

Instructions

  1. Preheat your oven to 350°F (175°C). Dice the peppers and onion, and chop the spinach.
  2. In a large skillet over medium-high heat, drizzle olive oil to coat the bottom. Add the sausage and sauté until fully cooked, about 5-7 minutes. Drain excess fat and set aside.
  3. Add onion, green, and red bell peppers to the same skillet and cook for about 2-3 minutes until softened. Add chopped spinach and cook for another minute until wilted.
  4. Return the sausage to the skillet, stir in garlic powder, Mrs. Dash seasoning, salt, and pepper until well combined.
  5. In a greased 9×13 baking dish, pour the sausage and veggie mix. In a medium bowl, whisk the eggs until frothy and stir in hot sauce if desired. Pour the egg mixture over the sausage and veggies.
  6. Sprinkle a touch of Mrs. Dash on top and bake for 25-30 minutes or until the egg is set and a knife comes out clean from the center. Allow to cool for 5-10 minutes before slicing.

Notes

Prepped ahead of time, this casserole can be stored in the refrigerator before baking for busy mornings. Leftovers can be stored for up to 4-5 days.

  • Prep Time: 15 minutes
  • Cook Time: 30 minutes
  • Category: Breakfast
  • Method: Baking
  • Cuisine: American

Nutrition

  • Serving Size: 1 slice
  • Calories: 230
  • Sugar: 2g
  • Sodium: 400mg
  • Fat: 14g
  • Saturated Fat: 4g
  • Unsaturated Fat: 8g
  • Trans Fat: 0g
  • Carbohydrates: 8g
  • Fiber: 2g
  • Protein: 18g
  • Cholesterol: 300mg

Keywords: breakfast, casserole, Whole30, healthy, family meal

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