Classic High Protein Breakfast Casserole (30g Protein Per Serving!)

This high protein breakfast casserole is the ultimate make-ahead breakfast for busy mornings! Packed with 30 grams of protein per serving, this hearty egg bake combines turkey sausage, cottage cheese, and eggs for a filling breakfast that will keep you satisfied all morning long. Perfect for meal prep, family breakfasts, or brunch gatherings.

Why You’ll Love This High Protein Breakfast Casserole

I’ve been making this protein-packed breakfast casserole every Sunday for the past year, and it’s completely changed my weekday mornings. Instead of grabbing a sugary granola bar on my way out the door, I reheat a slice of this savory casserole and actually feel fueled until lunch.

What makes this recipe special is the combination of cottage cheese and eggs – it creates an incredibly creamy texture while boosting the protein content to 30 grams per serving. That’s more protein than most protein shakes, and it actually tastes like real food!

Here’s why this breakfast casserole works so well:

• Serious protein power: With turkey sausage, cottage cheese, eggs, and cheese, you’re getting a complete amino acid profile
• Make-ahead friendly: Assemble the night before and bake in the morning, or bake ahead and reheat throughout the week
• Customizable: Easy to swap vegetables, cheese types, or protein sources based on what you have
• Budget-friendly: Uses simple, affordable ingredients that you probably already have
• Freezer-friendly: Make a double batch and freeze individual portions for up to 3 months

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Ingredient Notes

Turkey Sausage – I use turkey breakfast sausage because it’s leaner than pork but still gives that savory breakfast flavor. You can substitute with chicken sausage, regular pork sausage, or even vegetarian sausage. For meal prep, I buy the pre-cooked crumbles to save time.

Cottage Cheese – This is the secret weapon for extra protein! Use full-fat cottage cheese for the creamiest texture. If you’re not a cottage cheese fan, don’t worry – it completely melts into the casserole and you won’t taste it separately. Greek yogurt can work as a substitute, but cottage cheese provides more protein.

Eggs – You’ll need 10 large eggs. I buy the organic pasture-raised eggs when possible for the best flavor and nutrition, but regular eggs work perfectly fine.

Cheddar Cheese – Sharp cheddar adds great flavor. You can use any cheese you like – pepper jack for spice, mozzarella for mild flavor, or a Mexican blend.

Hash Browns – I use frozen shredded hash browns for convenience. No need to thaw them first! If you prefer fresh, you can shred 2 large russet potatoes.

Vegetables – Bell peppers and onions are my go-to, but you can add spinach, mushrooms, tomatoes, or zucchini. Just make sure to sauté watery vegetables first to avoid a soggy casserole.

Milk – Whole milk makes the casserole rich and creamy. You can use 2% milk, but I don’t recommend skim – it won’t be as creamy. For dairy-free, use unsweetened almond milk.

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How to Make High Protein Breakfast Casserole

Step 1: Prep Your Ingredients

Preheat your oven to 375°F (190°C) and grease a 9×13-inch baking dish with cooking spray or butter.

If using raw turkey sausage, cook it in a large skillet over medium-high heat, breaking it into crumbles as it cooks. This takes about 8-10 minutes. Drain any excess fat and set aside. While the sausage cooks, dice your bell peppers and onions.

Pro tip: I like to prep all my vegetables the night before and store them in the fridge. It makes assembly super quick in the morning!

Step 2: Sauté the Vegetables

In the same skillet you used for sausage, add a little olive oil and sauté the diced onions and bell peppers for 5-6 minutes until softened. Season with a pinch of salt and pepper. This step removes excess moisture and concentrates the flavors.

Step 3: Make the Egg Mixture

In a large mixing bowl, whisk together the eggs, cottage cheese, and milk until well combined. Don’t worry if there are small cottage cheese curds – they’ll melt during baking. Season with salt, pepper, garlic powder, and a pinch of paprika.

Why this works: Whisking the cottage cheese with eggs helps distribute the protein evenly and creates a smooth, creamy base.

Step 4: Assemble the Casserole

Spread the frozen hash browns evenly across the bottom of your prepared baking dish. Layer the cooked turkey sausage over the hash browns, then add the sautéed vegetables. Pour the egg mixture evenly over everything, making sure it seeps into all the layers. Top with shredded cheddar cheese.

Pro tip: Use a fork to gently press down on the layers to help the egg mixture penetrate all the way to the bottom.

Step 5: Bake

Bake uncovered for 40-45 minutes, until the center is set and the top is golden brown. The casserole is done when a knife inserted in the center comes out clean and the internal temperature reaches 160°F.

Let it cool for 10 minutes before slicing – this helps it set up and makes cleaner slices.

Storage and Reheating Instructions

Refrigerator: Store covered in the fridge for up to 5 days. This makes it perfect for weekday breakfast meal prep! I portion it into individual containers on Sunday and grab one each morning.

Freezer: Cool completely, then cut into individual portions. Wrap each piece tightly in plastic wrap, then place in a freezer-safe container or bag. Freeze for up to 3 months. Thaw overnight in the fridge before reheating.

Reheating:

• Microwave: 90 seconds to 2 minutes for a single portion
• Oven: 350°F for 15-20 minutes, covered with foil
• Air fryer: 350°F for 8-10 minutes (gives a nice crispy top!)

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Recipe Variations

Vegetarian: Skip the sausage and add extra vegetables like mushrooms, zucchini, and spinach. Add 1/2 cup cooked quinoa for texture.

Mexican-Style: Use chorizo instead of turkey sausage, add black beans, jalapeños, and top with pepper jack cheese. Serve with salsa and avocado.

Italian-Inspired: Use Italian chicken sausage, add sundried tomatoes and spinach, use mozzarella cheese, and season with Italian herbs.

Lower Carb: Skip the hash browns entirely or use riced cauliflower instead. Protein content will be even higher!

Dairy-Free: Use dairy-free cheese and substitute cottage cheese with mashed silken tofu blended with nutritional yeast.

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Serving Suggestions

This high protein breakfast casserole is filling enough to eat on its own, but here are some of my favorite ways to serve it:

• With fresh fruit on the side (berries, melon, or sliced oranges)
• Top with avocado slices and hot sauce for extra healthy fats
• Serve with whole grain toast or English muffins
• Add a simple side salad for brunch
• Pair with Greek yogurt parfait for an extra protein boost

For gatherings, I set up a topping bar with salsa, sour cream, hot sauce, avocado, and fresh herbs so everyone can customize their slice.

Frequently Asked Questions

Can I make this breakfast casserole the night before? Yes! Assemble the entire casserole, cover tightly with plastic wrap or foil, and refrigerate overnight. In the morning, remove from fridge and let sit at room temperature for 20 minutes while the oven preheats. Bake as directed, adding 5-10 extra minutes if needed.

Can I freeze breakfast casserole before baking? Absolutely! Assemble the casserole in a freezer-safe dish, cover tightly with plastic wrap and then foil. Freeze for up to 2 months. Thaw completely in the fridge overnight, then bake as directed.

Why is my breakfast casserole watery? This usually happens if vegetables weren’t sautéed first to remove moisture, or if you used skim milk. Make sure to cook any watery vegetables (like mushrooms, zucchini, or spinach) before adding them. Also, let the casserole rest for 10 minutes after baking – it continues to set as it cools.

How do I know when the casserole is done? The center should be set (not jiggly), the top should be golden brown, and a knife inserted in the center should come out clean. Internal temperature should reach 160°F.

Can I use egg whites instead of whole eggs? You can, but the texture won’t be as rich and creamy. I recommend using at least 5 whole eggs and then egg whites for the rest if you want to reduce calories.

How much protein is really in each serving? Each serving contains approximately 30 grams of protein, broken down as follows: eggs (12g), turkey sausage (10g), cottage cheese (6g), cheese (2g). This makes it comparable to a protein shake but much more satisfying!

More Breakfast Recipes:

• Greek Yogurt Protein Casserole (26g Protein)
• Classic High Protein Breakfast Casserole (30g Protein)
• Amish Breakfast Casserole