Mornings are hectic enough without stressing over breakfast. This Spinach Egg Casserole is the answer to every busy parent’s morning chaos — make it once, slice it up, and you’ve got a high-protein, veggie-packed breakfast ready to grab and go for the entire week. It’s fluffy, cheesy, loaded with spinach, and takes just 10 minutes of hands-on prep before the oven does all the work. Whether you’re feeding your family or staying on top of your own healthy eating goals, this is the kind of breakfast meal prep recipe that changes your whole routine. It’s a reader favorite from our 90+ recipe collection, and once you try it, you’ll understand why.
Quick Info
Servings: 8 slices · Prep Time: 10 min · Cook Time: 35 min · Total: 45 min · Calories: ~210/serving
Ingredients
- 10 large eggs
- 5 oz fresh baby spinach, roughly chopped
- 1 cup shredded mozzarella cheese
- ½ cup crumbled feta cheese
- ½ cup milk (any kind — whole, 2%, or unsweetened almond)
- ½ cup diced red bell pepper
- ¼ cup diced sun-dried tomatoes (oil-packed, drained)
- ¼ cup diced yellow onion
- 2 cloves garlic, minced
- 1 tablespoon olive oil
- ½ teaspoon salt
- ¼ teaspoon black pepper
- ¼ teaspoon nutmeg (optional but adds a subtle warmth)
- Cooking spray for the pan
Instructions
- Preheat and prep the pan. Preheat your oven to 375°F (190°C). Spray a 9×13 inch baking dish with cooking spray and set aside.
- Sauté the vegetables. Heat olive oil in a skillet over medium heat. Add the onion and bell pepper and cook for 3 minutes until softened. Add the garlic and cook for 30 seconds until fragrant. Toss in the chopped spinach and stir until just wilted, about 1–2 minutes. Remove from heat and let cool slightly.
- Whisk the egg base. In a large bowl, whisk together the eggs, milk, salt, pepper, and nutmeg until smooth and well combined. No lumps — you want a uniform mixture for an even, fluffy bake.
- Combine everything. Add the sautéed vegetables, sun-dried tomatoes, mozzarella, and half the feta to the egg mixture. Stir gently to distribute everything evenly.
- Pour and top. Pour the mixture into the prepared baking dish. Scatter the remaining feta over the top. Give the dish a gentle shake to level everything out.
- Bake. Place in the oven and bake for 30–35 minutes until the center is set and the top is lightly golden. A toothpick inserted in the center should come out clean. The edges will be slightly puffed and golden brown.
- Cool and slice. Let the casserole rest for 5 minutes before slicing into 8 even pieces. This resting time helps it hold together when you cut.
Frequently Asked Questions
How long does this casserole last in the fridge? It keeps perfectly for up to 5 days in an airtight container, making it one of the most reliable breakfast meal prep recipes you can make. Just grab a slice each morning, reheat for 90 seconds in the microwave, and you’re out the door with a nutritious, high-protein breakfast.
Can I freeze individual portions? Yes — wrap each slice individually in plastic wrap, then place them all in a freezer bag. They’ll keep for up to 3 months. Thaw overnight in the fridge or microwave from frozen for about 2–3 minutes. Batch cooking and freezing like this is a game-changer for busy families.
What other vegetables can I add? Mushrooms, diced zucchini, broccoli florets, roasted sweet potato, or chopped kale all work beautifully. Just make sure any vegetables you add are pre-cooked or sautéed first so they don’t release excess moisture and make the casserole watery. This flexibility makes it an easy family-friendly meal everyone can customize.
Can I make this dairy-free? Absolutely. Swap the mozzarella for dairy-free shredded cheese, skip the feta or use a vegan crumble, and use unsweetened almond or oat milk. The texture stays fluffy and the flavor still delivers as a satisfying low-calorie meal.
Is this casserole good for weight loss? At just 210 calories per slice with around 16 grams of protein, it’s an excellent choice for anyone watching their intake. The combination of eggs, spinach, and cheese keeps you full for hours without the mid-morning crash you get from sugary breakfasts. For more high-protein, calorie-smart recipes like this, our full recipe ebook has plenty of options.
Your Mornings Just Got Easier
This Spinach Egg Casserole is the breakfast meal prep recipe that busy mornings have been waiting for. Ten minutes of prep on a Sunday gives you a full week of nutritious, delicious breakfasts that are ready when you are. High in protein, loaded with vegetables, and low enough in calories to fit any healthy eating plan — it checks every single box.
If this casserole just saved your morning routine, imagine what a whole library of recipes like this could do. Our complete 90+ recipe collection is full of easy meal prep ideas, quick healthy dinners, and family-friendly recipes designed for real life — not just Instagram. Get your copy today and make healthy eating the simplest part of your week.