high-Protein Butternut Squash Breakfast Casserole With Sausage

Posted on December 7, 2025

by: Amelia Grace

High-protein butternut squash breakfast casserole with sausage served on a plate

Eggs, sausage, and butternut squash—three hearty ingredients that come together in a mind-blowing breakfast casserole. This dish is not only protein-packed, with around 20 grams per serving, but it also fills your kitchen with a comforting, savory aroma that’s hard to resist. If you’re looking for a nutritious breakfast that’s as visually appealing as it is delicious, stay tuned. You’ll be assembling this fabulous dish in no time!

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Butternut Squash breakfast

Butternut Squash Breakfast Casserole With Sausage


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  • Author: james-carter
  • Total Time: 45 minutes
  • Yield: 6 servings 1x
  • Diet: Gluten-Free

Description

A hearty and nutritious breakfast casserole featuring butternut squash, sausage, and spinach, perfect for a power-packed start to your day.


Ingredients

Scale
  • 1/2 lb. lean ground turkey sausage
  • 2 tsp. olive oil
  • 2 cups butternut squash, peeled and diced
  • 1/2 red onion, diced
  • 1/2 tsp. salt
  • 1/2 tsp. garlic powder
  • 1/2 tsp. oregano
  • 1/2 tsp. pepper
  • 4 cups spinach, chopped
  • 4 eggs
  • 4 egg whites

Instructions

  1. Preheat the oven to 400 degrees F.
  2. Heat a skillet over medium-high heat and add the sausage, cooking until no longer pink.
  3. Remove the sausage and set aside.
  4. Add olive oil to the skillet, then add butternut squash and red onion; cook for 8-10 minutes until tender.
  5. Add salt, garlic powder, oregano, and pepper, stirring to combine.
  6. Toss in spinach and cook until wilted, about 1-2 minutes.
  7. Whisk together the eggs in a bowl until light and airy.
  8. Spread the sausage and vegetable mixture in a baking dish, then pour the whisked eggs over the top.
  9. Bake for 25-30 minutes until the eggs are set.

Notes

Serve warm with fresh fruit or a green salad.

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

Nutrition

  • Serving Size: 1 slice
  • Calories: 200
  • Sugar: 3g
  • Sodium: 300mg
  • Fat: 10g
  • Saturated Fat: 3g
  • Unsaturated Fat: 7g
  • Trans Fat: 0g
  • Carbohydrates: 12g
  • Fiber: 2g
  • Protein: 20g
  • Cholesterol: 150mg

Why This Butternut Squash Breakfast Casserole Is a Game-Changer

Let’s talk practicality. This Butternut Squash Breakfast Casserole With Sausage isn’t just any breakfast; it’s a fantastic way to start your day right. A unique combination of flavors and textures—the sweetness of the squash, the savory sausage, and the freshness of spinach—creates a satisfying meal that will keep you energized and full until lunch. Plus, it’s simple enough to whip up on a busy morning, making it a winner in my book!

What You’ll Need

  • 1/2 lb. lean ground turkey sausage: A nutritious protein to kick off your day.
  • 2 tsp. olive oil: For a heart-healthy touch and a flavorful sauté.
  • 2 cups butternut squash, peeled and diced: Sweet, creamy goodness that adds a beautiful color.
  • 1/2 red onion, diced: This will give us a savory depth.
  • 1/2 tsp. salt: Essential for bringing out the flavors.
  • 1/2 tsp. garlic powder: A subtle kick that rounds out the dish.
  • 1/2 tsp. oregano: A fragrant herb that complements the casserole’s heartiness.
  • 1/2 tsp. pepper: For a hint of warmth.
  • 4 cups spinach, chopped: Fresh greens to boost the nutritional value.
  • 4 eggs, plus 4 egg whites: A protein-packed base to bind everything together.

Step-by-Step Method

  1. Preheat the oven to 400 degrees. This ensures your casserole bakes evenly right from the start.
  2. Heat a skillet over medium-high heat. Get it ready for the sausage!
  3. Add the sausage and cook until no longer pink, breaking it up as it cooks. This adds texture, so be diligent!
  4. Remove the sausage and set it aside. Letting it rest for a minute will help keep it juicy.
  5. Add the olive oil to the pan and wait until it’s hot (you’ll see a shimmer on the surface). This will help cook the veggies perfectly.
  6. Once hot, add the butternut squash and red onion. Cook for 8-10 minutes until the squash and onion are tender, adding 1-2 tablespoons of water if burning. This keeps things moist and prevents any sticking!
  7. Add the salt, garlic powder, oregano, and pepper. Stir together, letting those spices meld.
  8. Toss in the spinach and cook until it wilts, about 1-2 minutes. Fresh spinach adds bulk and nutrients without overpowering the rest!
  9. Whisk together the eggs—this step is crucial for an airy texture.
  10. Add the sausage and butternut squash mixture to a baking dish sprayed with cooking spray. Even distribution is key!
  11. Pour the eggs over the top. Make sure you coat everything evenly, so every bite is delightful.
  12. Bake for 25-30 minutes until the eggs set and are cooked through. A gentle jiggle in the center is okay; it will firm up as it cools.

Balanced Bites

This dish serves about 6 and offers approximately 200 calories, 20 grams of protein, 12 grams of carbohydrates, and 10 grams of fat per serving. The fiber from the spinach and butternut squash adds to the recipe’s health profile, keeping you fuller for longer. Consider it a balanced breakfast you can feel good about!

How to Serve It Best

This casserole shines best when served warm from the oven. A side of fresh fruit or a light green salad can add a refreshing, juicy contrast while helping round out your morning meal. Pair it with a steaming cup of coffee or a freshly squeezed orange juice for the full breakfast experience—enjoy it at gatherings or cozy Sundays at home!

Smart Reheat Tricks

For storage, place leftovers in an airtight container in the fridge; they’ll keep for about 3-4 days. You can freeze portions in freezer-safe containers for up to three months. When reheating, pop it in the microwave for 1-2 minutes or bake it in the oven at 350 degrees until heated through. Just remember to cover it with foil to retain moisture!

Pro Tips

  • Choose the Right Squash: Opt for firm, unblemished butternut squash for the best flavor and texture.
  • Egg Tempering: Whisking the eggs well increases fluffiness—combine them until light and airy.
  • Sauté at the Right Temperature: Medium-high is best for quick cooking without burning. Too hot can scorch your veggies!
  • Customize Egg Ratios: Feel free to test out different ratios of whole eggs to egg whites based on your dietary preferences.
  • Bake to Perfection: Always keep an eye on the casserole in the last few minutes; oven temperatures vary, and you don’t want it overbaked!

Flavor Experiments

Want to switch things up? Try these variations:

  • Seasonal Twist: Swap out the butternut squash for roasted sweet potato in the fall for extra sweetness.
  • Gourmet Option: Add crumbled feta cheese and sun-dried tomatoes for a Mediterranean flair.
  • Playful Addition: Toss in some diced bell peppers or hot sauce for a zesty kick!

Learn from My Mistakes

  • Too Much Oil?: Avoid greasy results by measuring your olive oil carefully; too much can make the dish too oily.
  • Eggs Not Set?: If the casserole isn’t firm after baking, it may need a few more minutes—check in every few minutes until it’s set.
  • Burnt Bottom: If you see the bottom browning too quickly, lower the oven temperature slightly or cover the casserole with aluminum foil.
  • Soggy Spinach?: Don’t overcook your spinach; add it just long enough to wilt without losing its vibrant color and texture.
  • Bland Flavor?: Always taste before serving! It’s easier to adjust seasoning before it hits the table.

What to Do with Leftovers

  • Breakfast Wraps: Stuff leftover casserole into whole-grain wraps with some avocado for a hearty breakfast on-the-go.
  • Savory Muffins: Chop up leftovers and mix into a muffin batter for a nutritious snack or breakfast treat.
  • Egg Fried Rice: Use remnants to make a delightful egg fried rice dish, mixing in more veggies and soy sauce for flair.

Quick Questions

  • Can I use regular sausage instead of turkey sausage? Absolutely! Regular sausage will add more flavor, but be mindful of the fat content.
  • How long does this casserole last in the fridge? You can store it for about 3-4 days in an airtight container.
  • Can I prepare this dish in advance? Yes! You can assemble it the night before and bake it in the morning for an easy breakfast.
  • What if I don’t like spinach? Try kale or even zucchini instead! You can substitute with your favorite greens or veggies.

Now that you have all the tips and tricks at your fingertips, go ahead and whip up this Butternut Squash Breakfast Casserole With Sausage—it’s a guaranteed crowd-pleaser that you’ll want on repeat!

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