High Protein Egg Casserole

My refrigerator buzzed louder than usual that January morning, almost as if it knew I was staring blankly at its contents hoping breakfast would invent itself. A sleeve of turkey sausage sat next to a carton of eggs and a random tub of cottage cheese I had bought on a whim. I dumped everything into a bowl with zero plan, and forty minutes later I was eating the most satisfying breakfast I had made all year. That casserole has since become my Sunday ritual, the one thing I make before the week runs me over.

I brought a pan of this to a friend who had just had her second baby, and she texted me three days later asking if it was weird to eat it cold straight from the fridge at midnight during a feeding session. That might be the highest compliment a casserole can receive.

Ingredients

• 10 large eggs: The backbone of the entire dish, so use the freshest ones you can find for the best color and lift.
• 200 g lean turkey sausage, crumbled and cooked: Browning it first renders out excess moisture so your casserole never turns soggy.
• 120 g low-fat cottage cheese: This is the secret weapon that makes everything creamy without weighing it down.
• 100 g shredded reduced-fat cheddar cheese: Reserve half for the top so you get that golden, blistered cheese cap everyone fights over.
• 1 red bell pepper, diced: Adds sweetness and a pop of color that makes the dish look as good as it tastes.
• 1 small onion, diced: A quiet background note that rounds out every bite.
• 80 g baby spinach, roughly chopped: It wilts down to almost nothing, so do not worry if it looks like a lot going in.
• 1 tsp garlic powder: Distributes more evenly than fresh garlic and plays nicely with the smoked paprika.
• 1/2 tsp smoked paprika: Just enough to give a faint campfire warmth without overpowering the eggs.
• 1 tsp salt and 1/2 tsp black pepper: Season boldly because the cottage cheese and vegetables will absorb quite a bit.

Instructions

Preheat and prepare the dish:

Set your oven to 180 degrees Celsius (350 degrees Fahrenheit) and grease a 22 by 33 cm casserole dish generously so nothing sticks when you slice later.

Whisk the egg mixture:

Crack all ten eggs into a large bowl, then add the cottage cheese, garlic powder, smoked paprika, salt, and pepper, whisking until the mixture looks uniform and slightly frothy.

Fold in the fillings:

Stir in the cooked turkey sausage, diced bell pepper, onion, chopped spinach, and half the cheddar, folding gently so you do not deflate the eggs.

Assemble and top:

Pour everything into your prepared dish and scatter the remaining cheddar evenly across the surface, letting it fall into the nooks and crannies.

Bake until set:

Slide the dish into the oven uncovered and bake for 30 to 35 minutes, checking that the center no longer jiggles and the top has turned a warm golden brown.

Rest and serve:

Let the casserole sit for about five minutes before cutting into squares, which helps it hold its shape on the plate.

Save to Pinterest

There is something quietly powerful about pulling a bubbling dish out of the oven on a Sunday afternoon and knowing the next five mornings are already handled.

Making It Your Own

Swap the turkey sausage for lean chicken sausage or even a plant-based alternative and the structure holds up perfectly. Toss in mushrooms, zucchini, or sun-dried tomatoes depending on what needs using up in your crisper drawer. I once added leftover roasted sweet potatoes and it turned into something entirely new and wonderful.

Storage and Reheating

Cut the cooled casserole into individual portions and store them in airtight containers in the refrigerator for up to five days. A quick 60-second spin in the microwave brings each square back to life without making it rubbery. You can also freeze portions between sheets of parchment for up to two months, though the texture of the spinach softens slightly upon thawing.

Serving Suggestions

A spoonful of salsa or a few dashes of hot sauce on top wakes up every flavor on the plate. Serve it alongside sliced avocado or a handful of fresh fruit for a breakfast that feels complete rather than purely functional.

• A dollop of plain Greek yogurt on top adds tang and an extra protein boost.
• Warm corn tortillas on the side turn leftover slices into impromptu breakfast tacos.
• Sprinkle fresh cilantro or scallions over the top right before serving for a bright finish.

Save to Pinterest

This is the kind of recipe that quietly earns a permanent spot in your rotation, not because it is flashy, but because it works every single time. Make it once and you will never stare blankly into your fridge on a Sunday morning again.

Questions & Answers About the Recipe

→ Can I make this ahead of time?

Yes, this casserole is perfect for meal prep. Bake it on Sunday, slice into portions, and store in the refrigerator for up to 5 days. Reheat individual portions in the microwave for 2-3 minutes.

→ What other proteins can I use?

Lean chicken sausage, crumbled bacon, or vegetarian sausage work well. For extra protein boost, add diced ham or cooked chicken breast.

→ Can I freeze this casserole?

Absolutely. Wrap the cooled, baked casserole tightly in plastic wrap and foil, then freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.

→ How do I know when it's done?

The casserole is ready when the center is set and no longer jiggly, and the top is lightly golden. A knife inserted in the center should come out clean.

→ What vegetables work best?

Bell peppers, onions, and spinach are classic choices. You can also add mushrooms, zucchini, diced tomatoes, or broccoli for extra nutrition and variety.

→ Is this suitable for a keto diet?

Yes, with only 5 grams of carbohydrates per serving, this casserole fits well into a keto or low-carb eating plan while providing substantial protein.