The Ultimate Easy Whole30 Breakfast Casserole (High-Protein!)

Imagine a warm, savory slice of breakfast casserole, absolutely loaded with flavorful ground turkey, fresh veggies, and fluffy eggs, that you can enjoy any morning of the week. That, my friends, is the simple, powerful magic of this Easy Whole30 Breakfast Casserole. It’s a complete, high-protein meal in one dish that is as perfect for a lazy Sunday brunch as it is for a week of grab-and-go meal prep. This is, without a doubt, my all-time favorite recipe for a satisfying and healthy start to the day.

I promise you, there is no greater feeling than having a delicious, healthy, homemade breakfast waiting for you in the fridge on a busy morning. The combination of savory seasoned turkey, earthy mushrooms, sweet red peppers, and nutrient-dense spinach is just perfect. It’s a low-carb, lower-calorie meal that will genuinely keep you full and energized for hours.

Get ready to discover your new go-to recipe for a delicious, high-protein breakfast that makes healthy eating feel effortless.

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Why This Breakfast Casserole is a Meal Prep Dream!

You are going to be completely obsessed with how easy and delicious this casserole is. It’s a true kitchen staple. Here’s why you’ll love it:

• Packed with 30g of Protein: This isn’t a light breakfast; it’s a powerhouse meal that will keep you feeling full, satisfied, and energized all morning long.
• Incredibly Quick and Easy to Prep: With just 10 minutes of active prep time, this is a super simple “dump and bake” style casserole that anyone can make.
• Perfect for Meal Prep: This recipe is a game-changer for busy weeks. Bake it once on a Sunday and have a healthy, high-protein breakfast ready to go for days.
• Naturally Healthy and Compliant: This casserole is naturally Whole30, Paleo, gluten-free, and dairy-free, making it perfect for a wide range of healthy lifestyles.
• Completely Customizable: Think of this as your perfect template! You can easily swap the protein or the veggies to use up what you have on hand.

Recipe Snapshot

Your Shopping List for This High-Protein Casserole

This recipe uses a handful of simple, wholesome ingredients to create a flavor-packed meal. Here’s what you’ll need:

→ For the Casserole

• 1 pound lean ground turkey → Ground chicken also works wonderfully.
• 1 Tablespoon avocado oil → A great high-heat oil for cooking the turkey.
• 2 teaspoons everything seasoning → A fantastic, flavorful shortcut! Use any compliant seasoning you love.
• 10 large eggs → The fluffy, protein-rich base that holds everything together.
• 8 ounces sliced mushrooms → Crimini, white button, or portobello all work great.
• 1 medium red pepper → Chopped, for a touch of sweetness and color.
• 2 cups spinach or kale → Chopped, for a fantastic boost of nutrients.

→ For the Egg Seasoning

• 1 teaspoon salt
• ½ teaspoon pepper
• 1 teaspoon garlic powder
• ½ teaspoon paprika

Let’s Get Baking! Your Step-by-Step Guide

Ready to create the easiest, most satisfying breakfast casserole ever? Let’s get to it!

Part 1: Prepare the Casserole Components

1. Prep the Oven and Pan: Preheat your oven to 425°F. Lightly grease a 9×9-inch baking pan.
2. Cook the Turkey: In a large skillet over medium heat, cook the ground turkey in the avocado oil with the everything seasoning for about 10 minutes, breaking it up with a spoon, until it’s fully cooked through.
3. Whisk the Eggs: While the turkey is cooking, whisk the eggs together in a large bowl with the salt, pepper, garlic powder, and paprika.

Part 2: Assemble and Bake

4. Layer the Ingredients: In your prepared baking pan, create an even layer of the cooked turkey, followed by the sliced mushrooms, chopped red pepper, and chopped spinach.
5. Pour and Bake: Gently pour the whisked egg mixture evenly over the entire casserole dish, making sure it seeps into all the nooks and crannies.
6. Bake to Perfection: Place the dish in the oven and bake for about 30 minutes. The casserole is done when the eggs are fully set in the center and the edges are golden brown.
7. Rest and Serve: Let the casserole cool for at least 5 minutes before slicing into 6 pieces. This is a crucial step to help it set up for clean slices! Enjoy hot, or let it cool completely to store for meal prep.

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Easy Whole30 Breakfast Casserole

This easy Whole30 Breakfast Casserole is perfect for meal prep! Packed with 30g of protein from ground turkey and eggs, and loaded with fresh veggies, it’s a high-protein, low-carb, and flavorful recipe that’s ready in just 40 minutes.

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Prep Time 10 minutes mins

Cook Time 30 minutes mins

Total Time 40 minutes mins

Servings: 6

Course: Breakfast, Main Course

Cuisine: American

Calories: 243

Ingredients Equipment Method Notes

Ingredients

  

• 1 pound lean ground turkey
• 1 Tablespoon avocado oil
• 2 teaspoons everything seasoning or other compliant seasoning
• 10 large eggs
• 1 teaspoon salt
• 1/2 teaspoon pepper
• 1 teaspoon garlic powder
• 1/2 teaspoon paprika
• 8 ounces sliced mushrooms
• 1 medium red pepper chopped
• 2 cups spinach or kale chopped

Equipment

• 9×9″ Baking Pan
• Large Skillet
• Large Bowl
• Whisk

Method

 

1. Preheat the oven to 425 degrees F and grease a 9×9″ baking pan.
2. Cook the ground turkey in the avocado oil and everything seasoning over medium heat for about 10 minutes, or until fully cooked.
3. Meanwhile, whisk the eggs with the salt, pepper, garlic powder, and paprika in a large bowl.
4. Combine the cooked turkey, mushrooms, red pepper, and spinach in the prepared casserole dish.
5. Pour the whisked egg mixture over the entire casserole dish.
6. Bake for about 30 minutes, or until the eggs are fully set in the center.
7. Let cool for at least 5 minutes before slicing into 6 pieces and serving.

Notes

Make-Ahead: You can fully assemble the unbaked casserole, cover, and keep it in the fridge overnight. Bake in the morning as directed (you may need to add 5-10 minutes).

Storage: Store baked and cooled slices in an airtight container in the fridge for up to 5 days for quick breakfasts.

Freezing: Wrap individual slices and freeze for up to 3 months. Thaw overnight in the fridge before reheating.

WiseRecipes’ Top Tips for the Perfect Casserole

These simple secrets will help you achieve flawless, delicious results every single time.

1. Don’t Crowd the Pan. A 9×9-inch pan is the perfect size for this recipe. It allows the casserole to be thick enough to be substantial, but not so thick that the center takes forever to cook.
2. Whisk Your Eggs Well. Take a full minute to whisk the eggs until they are light, frothy, and a uniform pale yellow color. This helps to create a fluffier, more tender final texture.
3. The “Jiggle Test” for Doneness. To check if the casserole is done, gently shake the pan. The edges should be firm and set, and the very center should have no visible jiggle. If it’s still liquidy in the middle, it needs a few more minutes.
4. Let it Rest Before Slicing! This is a non-negotiable step. Just like a quiche or a lasagna, the casserole needs at least 5-10 minutes to cool and set after coming out of the oven. If you slice it while it’s piping hot, it will be delicate and may fall apart.
5. Get Creative with Veggies. This is a great “clean out the fridge” recipe. Feel free to swap the spinach and peppers for other veggies like chopped broccoli, diced onions, or zucchini. Just be mindful of high-water vegetables, which might need to be sautéed first.

Keep It Fresh! Storing and Reheating

This recipe was born for meal prep. Here’s how to store it for maximum convenience.

• Make-Ahead (Unbaked): You can fully assemble the casserole in the baking dish, cover it tightly, and store it in the refrigerator overnight. In the morning, just pop it in the oven to bake (you may need to add 5-10 minutes to the baking time since it’s starting from cold).
• Refrigerator (Baked): Once baked and cooled, you can store the entire casserole or individual slices in an airtight container in the refrigerator for up to 5 days.
• Freezing (Baked): This casserole freezes beautifully! Wrap individual cooled slices in plastic wrap and then place them in a freezer-safe bag. They will keep for up to 3 months. Thaw overnight in the fridge before reheating.
• Reheating: The easiest way to reheat a slice is in the microwave for 1-2 minutes until warmed through. You can also reheat in a toaster oven or a conventional oven.

FAQs: Your Breakfast Casserole Questions, Answered!

Can I use a different protein?

Yes, absolutely! This recipe is fantastic with ground chicken, ground sausage (ensure it’s Whole30 compliant if needed), or even ground beef. Just be sure to drain any excess fat after cooking the meat and before adding it to the casserole dish.

Can I make this vegetarian?

Of course! To make a vegetarian version, simply omit the ground turkey and double the amount of mushrooms. You could also add other hearty vegetables like diced potatoes (par-cooked first) or extra peppers and onions to make it more substantial.

My casserole seems watery. What happened?

This is usually caused by excess moisture from the vegetables. Make sure you’re using fresh spinach (not frozen, unless it’s been thawed and squeezed completely dry) and that your mushrooms are fresh. Sautéing the mushrooms and peppers with the turkey can also help cook off some of their excess water before baking.

Can I add cheese to this?

If you are not following a strict Whole30 or dairy-free diet, a sprinkle of your favorite shredded cheese (like cheddar or a Monterey Jack blend) on top during the last 5-10 minutes of baking would be absolutely delicious!

Final Thoughts: Your Easiest Healthy Breakfast

There is such a wonderful sense of calm and control that comes from having a healthy, delicious meal prepped and ready to go for the week. This Easy Whole30 Breakfast Casserole is the key to that feeling. It’s a simple, versatile, and incredibly satisfying recipe that makes clean eating feel like a treat. I hope it becomes a staple in your meal prep routine. Enjoy!