High Protein Egg Casserole

The smell of paprika toasting in a cast iron skillet on a rainy Saturday morning is enough to make anyone forget about cereal forever.

My roommate walked into the kitchen halfway through this casserole baking and stood there with the oven door cracked open, just breathing it in.

Ingredients

• 8 large eggs: The backbone of the whole dish, so grab the freshest ones you can find.
• 1 cup low-fat cottage cheese: This melts into the eggs and creates a texture you will not believe until you try it.
• 1 cup shredded reduced-fat cheddar cheese: Sharp cheddar gives more flavor per bite than mild, so go sharp if you have the choice.
• 200 g lean turkey sausage or chicken breast, cooked and diced: Brown it well first because that caramelization carries straight into the bake.
• 1 red bell pepper, diced: Sweetness and color that brighten every forkful.
• 1 small onion, finely chopped: Yellow or white both work, just keep the pieces small so they cook through evenly.
• 2 cups baby spinach, roughly chopped: It wilts down to almost nothing, so do not be shy with the amount.
• 1 tsp olive oil: Just enough to get the vegetables going without making things greasy.
• 1/2 tsp black pepper, salt, smoked paprika, and dried oregano: The paprika is the real hero here, adding a whisper of campfire warmth.

Instructions

Warm up the oven:

Set it to 180 degrees Celsius (350 degrees Fahrenheit) and grease your 9 by 13 inch baking dish with a little olive oil so nothing sticks later.

Soften the vegetables:

Heat olive oil in a skillet over medium heat, then sauté the onion and bell pepper for about 3 to 4 minutes until they turn fragrant and tender. Toss in the spinach and stir for one more minute until it collapses into a dark green heap, then pull the pan off the heat.

Build the custard:

Crack all eight eggs into a big bowl and beat them well, then whisk in the cottage cheese, cheddar, salt, pepper, paprika, and oregano until everything looks unified. Fold in your cooked meat and the sautéed vegetables with a gentle hand.

Pour and spread:

Transfer the mixture into your prepared dish and use a spatula to nudge it into an even layer so every square bakes at the same pace.

Bake until golden:

Slide it into the oven for 35 to 40 minutes, checking that the center is set and the top has taken on a lovely golden blush.

Rest before slicing:

Give it five minutes to cool and firm up, which makes cutting clean squares so much easier.

Save

I packed leftovers of this into a container for a road trip once and ate it cold at a rest stop, and honestly it was still better than most restaurant breakfasts.

What to Serve Alongside It

A simple green salad with a bright vinaigrette cuts through the richness beautifully, or you can keep things sweet with a pile of fresh fruit on the side.

Making It Your Own

Mushrooms, zucchini, or even sun-dried tomatoes can fold right into the egg mixture without changing the bake time.

Storage and Reheating

This casserole holds up in the fridge for up to four days, making it ideal for Sunday meal prep.

• Reheat individual squares in the microwave for about 60 seconds and they taste almost fresh from the oven.
• Freeze portions wrapped tightly in foil for up to one month if you want a grab-and-go breakfast ready at all times.
• Always label your containers because trust me, every leftover looks the same after a week.

Save

Once you have this recipe in your back pocket, weekend mornings feel a little more intentional and a lot more delicious.

Questions & Answers

→ Can I make this ahead of time?

Yes. Assemble the mixture and store covered in the fridge for up to 24 hours before baking. If baked in advance, cool, wrap tightly and refrigerate for up to 3 days.

→ How should leftovers be stored and reheated?

Store cooled portions in an airtight container in the fridge for 3–4 days. Reheat individual squares in the oven at 180°C (350°F) for 8–10 minutes or microwave briefly until warmed through.

→ Can I freeze portions?

Yes. Freeze fully cooled, baked squares individually on a tray, then transfer to a sealed bag for up to 2 months. Thaw overnight in the fridge and reheat in the oven until hot.

→ What vegetarian swaps work best?

Replace the turkey with cooked plant-based sausage or extra vegetables such as mushrooms and zucchini. Increasing cottage cheese or adding crumbled firm tofu can boost protein and texture.

→ How can I prevent a soggy center?

Ensure vegetables are sautéed until most moisture evaporates before adding. Use cottage cheese that’s not overly watery and bake until the center is set and lightly golden; allow a 5-minute rest before cutting.

→ Is this suitable for gluten-free diets?

The base ingredients are naturally gluten-free, but check processed items like sausage or seasoning blends for hidden gluten before using.