High Protein Egg Casserole

The Saturday morning my refrigerator decided to quit was honestly the best thing that could have happened to my meal prep routine. I stood there staring at a dozen eggs, a random tub of cottage cheese, and some leftover turkey sausage, daring myself to throw it all together instead of ordering takeout again. That desperate, slightly chaotic breakfast experiment turned into the single most requested dish in my household, and now I make it every Sunday without fail.

My roommate walked into the kitchen just as I was pulling the first golden, puffed up casserole from the oven, and she stopped mid sentence to ask what smelled so incredible. We stood at the counter with forks, skipping plates entirely, and polished off a quarter of the pan before it had even properly cooled.

Ingredients

• 10 large eggs: The foundation of the entire dish, so grab the best quality you can find since they carry the texture and structure.
• 1 cup low fat cottage cheese: This is the secret weapon that makes every bite creamy and adds a serious protein boost without heaviness.
• 1 cup cooked turkey sausage, sliced or crumbled: Lean, savory, and satisfying, it brings the kind of hearty flavor that makes you forget this is a healthy meal.
• 1 cup shredded reduced fat cheddar cheese: Melts into golden pockets throughout the casserole and ties all the flavors together beautifully.
• 1 bell pepper, diced: Adds a sweet crunch and bright color that balances the richness of the eggs and cheese.
• 1 cup baby spinach, chopped: Wilts down during baking so even people who avoid greens will barely notice it is there.
• 1/2 cup cherry tomatoes, halved: Little bursts of acidity that keep each bite feeling fresh and vibrant.
• 1/2 small red onion, diced: A mild, sweet bite that rounds out the vegetables without overpowering anything.
• 1/2 teaspoon garlic powder: Delivers a warm, savory depth without the risk of burning raw garlic in the oven.
• 1/2 teaspoon smoked paprika: This tiny amount adds a subtle smokiness that makes people ask what your secret ingredient is.
• 1/2 teaspoon black pepper and 1/2 teaspoon salt: Simple seasonings that enhance everything else without stealing the spotlight.
• Cooking spray or a little olive oil: Just enough to keep the casserole from sticking so every slice comes out cleanly.

Instructions

Get your oven ready:

Preheat to 375 degrees and lightly grease a 9 by 13 inch baking dish with cooking spray or a thin slick of olive oil so nothing sticks later.

Whisk the base:

Crack all ten eggs into a large bowl, add the cottage cheese, and whisk aggressively until the mixture looks uniformly combined and slightly frothy on top.

Fold in the good stuff:

Add the turkey sausage, cheddar, bell pepper, spinach, tomatoes, red onion, garlic powder, smoked paprika, pepper, and salt, then stir gently so everything is evenly distributed without crushing the vegetables.

Pour and spread:

Transfer the mixture into your prepared baking dish, using a spatula to nudge the vegetables and sausage into an even layer so every slice gets the same delicious ratio.

Bake until golden:

Slide it into the oven for 30 to 35 minutes, watching for the center to be fully set and the top to turn a lovely light golden color with slightly crispy edges.

Rest and serve:

Let the casserole sit for about five minutes before slicing, which helps it hold its shape and makes serving so much cleaner and easier.

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The first time I brought this to a brunch potluck, three separate people asked for the recipe before I even set the pan down on the table.

Storage and Reheating

This casserole holds up beautifully in the fridge for up to four days, making it perfect for grabbing a quick breakfast on busy mornings. I cut the whole pan into six portions, wrap each one in parchment paper, and stack them in a container so reheating takes about ninety seconds in the microwave.

Easy Swaps and Variations

You can swap the turkey sausage for diced cooked chicken or lean ham depending on what you have on hand. For a vegetarian version, simply leave out the meat entirely and load up on extra vegetables like mushrooms, zucchini, or even a handful of black beans for added substance and fiber.

Serving Suggestions

I love pairing a warm slice with a simple arugula salad dressed in lemon juice and olive oil when I want to turn breakfast into a proper meal. A dollop of plain Greek yogurt on top adds a nice tang that complements the smoky paprika better than you might expect.

• Try a few dashes of hot sauce if you like a little morning heat.
• Avocado slices on top make it feel like a cafe breakfast without any extra cooking.
• Always let it rest those five minutes before cutting so your slices look as good as they taste.

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Some recipes become staples because they are easy, and others earn their spot because they make you genuinely excited to eat breakfast. This one somehow manages to do both, and I hope it becomes a Sunday tradition in your kitchen too.

Recipe Questions

→ Can I make this egg casserole ahead of time?

Yes, you can assemble the casserole the night before and refrigerate it unbaked. When ready to serve, bake as directed, adding a few extra minutes if baking from cold. This makes breakfast prep incredibly convenient for busy mornings.

→ What vegetables work best in this high-protein casserole?

The combination of bell peppers, spinach, cherry tomatoes, and red onion provides excellent flavor and texture. You can easily substitute other vegetables like mushrooms, zucchini, broccoli, or asparagus based on what you have available or prefer.

→ Is this casserole suitable for meal prep?

Absolutely. This casserole keeps well refrigerated for up to 4 days. Slice into individual portions and store in airtight containers for quick grab-and-go breakfasts throughout the week. Reheat each serving in the microwave for 1-2 minutes.

→ Can I make this vegetarian?

Simply omit the turkey sausage and add extra vegetables or plant-based protein alternatives. You could increase the cheese, add more spinach, incorporate mushrooms for umami flavor, or use plant-based sausage crumbles for similar texture.

→ What makes this casserole high in protein?

Each serving contains 10 eggs plus cottage cheese, turkey sausage, and cheddar cheese, totaling 23 grams of protein per portion. The combination of eggs and dairy provides complete proteins with all essential amino acids for muscle recovery and satiety.

→ What temperature should the oven be set to?

Preheat your oven to 375°F (190°C) for best results. This temperature allows the casserole to cook through evenly while developing a lightly golden top without burning the cheese or vegetables.