If mornings feel rushed, chaotic, or just plain exhausting, this High-Protein Greek Omelette Casserole is the kind of recipe that quietly saves the week. You mix, bake, slice, and suddenly breakfast is handled for days.
It has everything you want in a balanced, healthy breakfast recipe — fluffy eggs, sautéed spinach, sweet tomatoes, and creamy feta. The flavors are bold but simple. The texture is soft and satisfying. And with 11 grams of protein per slice, it keeps you full without weighing you down.
This Greek omelette casserole is perfect for meal prep, low carb eating, and clean, high-protein mornings. You can serve it warm straight from the oven or grab a slice cold from the fridge on busy days. It is flexible, forgiving, and built for real life.
Ready in just 30 minutes, this is one of those high protein breakfast ideas that works just as well for brunch as it does for weekday fuel.
Look at the Recipe
- Fluffy, savory, and packed with Mediterranean flavor
- High-protein and naturally low carb
- Perfect for meal prep and busy mornings
Ingredients Needed
- 10 eggs, whisked
- 1 tablespoon olive oil
- 1 small white onion, diced
- 3 cups fresh spinach, tightly packed
- 1 teaspoon dried oregano
- ½ teaspoon salt
- 3 tomatoes, seeded and diced
- ½ cup crumbled feta cheese
How to Make Our High-Protein Greek Omelette Casserole
1. Preheat the Oven
Preheat oven to 400°F. Grease a 2-quart or 9×9-inch baking dish with butter or cooking spray.
2. Sauté the Onion
Heat olive oil in a pan over medium heat. Add diced onion and cook 2–3 minutes until soft and translucent.
3. Wilt the Spinach
Add spinach, oregano, and salt. Cook until spinach reduces and wilts completely.
4. Build the Base
Transfer the onion and spinach mixture into the baking dish. Add diced tomatoes and feta. Spread evenly.
5. Add the Eggs
Pour whisked eggs over the vegetables. Stir gently to distribute ingredients evenly.
6. Bake
Place in the oven and bake for 20–25 minutes until the center is set and no longer jiggly.
7. Cool and Slice
Let rest for 5 minutes before slicing. Serve warm or chilled.
This high-protein egg casserole pairs beautifully with avocado, fresh herbs, or a side of Greek yogurt for an extra protein boost.
Storage & Serving Suggestions
- Store covered in the refrigerator for 4–5 days.
- Enjoy cold or reheat gently in the microwave.
- Freeze individual slices for up to 2 months.
- Serve with fresh cucumber salad or whole-grain toast for a complete meal.
This recipe is ideal for easy meal prep and weight loss meals thanks to its balanced macros and simple ingredients.
Tips & FAQs
Can I add more vegetables?
Yes. Bell peppers, mushrooms, or zucchini work beautifully in this healthy breakfast casserole.
Can I use egg whites only?
Absolutely. Replace whole eggs with 2 cups egg whites for a lower-fat, higher-protein option.
Is this low carb?
Yes. With just 2 grams of carbs per slice, it fits well into low carb or macro-friendly eating.
Can I make it dairy-free?
Omit feta or use a dairy-free alternative.
Is this good for meal prep?
Yes. It holds texture and flavor for several days, making it a perfect high protein breakfast prep.
