This Spinach and Feta Egg Casserole is a delicious, protein-packed breakfast made with fluffy eggs, fresh spinach, tangy feta cheese, and savory seasonings. Baked until golden and set, this easy breakfast casserole is perfect for weekend brunch, meal prep, or a quick make-ahead breakfast. Every bite combines creamy eggs, tender spinach, and salty feta for a satisfying dish the whole family can enjoy.
Why This Recipe Works
- Easy to prepare: Requires simple ingredients and just a few minutes of preparation.
- Protein-rich: Eggs and feta cheese make this casserole filling and satisfying.
- Fresh and flavorful: Spinach, garlic, and feta create a delicious Mediterranean-inspired combination.
- Meal-prep friendly: Prepare it ahead of time and enjoy breakfast throughout the week.
Ingredients
- 8 large eggs
- 1 cup fresh spinach, roughly chopped
- ½ cup crumbled feta cheese
- ½ cup milk
- ¼ cup shredded mozzarella cheese
- ½ small onion, finely chopped
- 2 cloves garlic, minced
- 1 tablespoon olive oil
- ¼ teaspoon salt, or to taste
- ¼ teaspoon black pepper
- ½ teaspoon dried oregano
- ¼ teaspoon red pepper flakes (optional)
- Cooking spray or butter for greasing the baking dish
How to Make Spinach and Feta Egg Casserole
1. Prepare the Oven and Baking Dish
Preheat your oven to 350°F (175°C). Lightly grease an 8 × 8-inch baking dish with cooking spray or butter to prevent the eggs from sticking.
2. Cook the Spinach Mixture
Heat olive oil in a skillet over medium heat. Add the chopped onion and cook for 3–4 minutes until softened. Stir in the minced garlic and cook for another 30 seconds.
Add the chopped spinach and cook for 2–3 minutes until wilted. Remove the skillet from the heat and allow the mixture to cool slightly.
3. Whisk the Eggs
In a large mixing bowl, crack the eggs and add the milk, salt, black pepper, dried oregano, and red pepper flakes. Whisk until the mixture is smooth and well combined.
4. Add the Cheese and Vegetables
Stir the cooked spinach mixture into the egg mixture. Add the crumbled feta and shredded mozzarella, reserving a little feta for the topping if desired. Gently mix everything together.
5. Assemble the Casserole
Pour the egg mixture into the prepared baking dish. Spread the spinach and cheese evenly so every serving has a good balance of ingredients. Sprinkle the remaining feta over the top.
6. Bake Until Set
Place the dish in the preheated oven and bake for 30–35 minutes, or until the center is set and a knife inserted near the middle comes out clean. Avoid overbaking to keep the eggs tender.
7. Rest and Serve
Remove the casserole from the oven and let it rest for 5–10 minutes before slicing. Cut into squares and serve warm.
Tips for the Best Spinach and Feta Egg Casserole
- Remove excess moisture: Cook fresh spinach before adding it to the eggs. If using frozen spinach, thaw and squeeze out all excess water.
- Use room-temperature eggs: They combine more easily with the other ingredients.
- Choose good-quality feta: Its salty, tangy flavor makes this casserole especially delicious.
- Don’t overbake: Remove the casserole as soon as the center is fully set.
- Adjust the seasoning: Taste your feta before adding extra salt, as some varieties are quite salty.
Easy Variations
- Spinach and Mushroom Egg Casserole: Add sautéed mushrooms for extra flavor and texture.
- Tomato and Feta Egg Casserole: Add chopped cherry tomatoes for a fresh, slightly sweet taste.
- Mediterranean Egg Casserole: Include diced red bell peppers, olives, and oregano.
- Sausage and Spinach Casserole: Add cooked breakfast sausage for a heartier meal.
- Low-Carb Breakfast Casserole: Enjoy the recipe as written without adding bread or potatoes.
What to Serve with Spinach and Feta Egg Casserole
Serve this breakfast casserole with fresh fruit, avocado slices, roasted potatoes, whole-grain toast, or a simple green salad. For brunch, pair it with fresh orange juice or coffee.
How to Store and Reheat
Allow the casserole to cool completely before storing. Transfer leftovers to an airtight container and refrigerate for up to 3–4 days.
To reheat, place individual portions in the microwave for 30–60 seconds or until warmed through. You can also reheat larger portions in a covered baking dish at 325°F (165°C).
For meal prep, divide the cooled casserole into individual portions and refrigerate them for easy breakfasts throughout the week.
Final Thoughts
Spinach and Feta Egg Casserole is a simple, flavorful breakfast that combines fluffy baked eggs, nutritious spinach, and creamy feta cheese. Whether you’re preparing a weekend brunch or planning breakfasts ahead of time, this easy casserole is a delicious addition to your morning routine.
