Spinach Feta Breakfast Casserole is a savory morning winner that balances convenience and flavor, perfect for busy families or meal prep. Did you know most people search for easy breakfast casseroles on Pinterest more than any other savory dish? This recipe uses frozen Potatoes O’Brien and crumbled feta for a hearty, protein-forward start to the day, making it ideal when paired with snacks like banana oatmeal protein breakfast cookies for a grab-and-go combo. This guide is clearer than most blog rundowns, with tested tips, quick substitutions, and step-for-step expectations. In this guide, you’ll learn how to build, bake, and store this casserole so it comes out perfect every time.
What Is Spinach Feta Breakfast Casserole?
Spinach Feta Breakfast Casserole is a layered egg bake combining potatoes, wilted spinach, eggs, milk, and tangy feta, baked until set. It is an adaptable make-ahead breakfast that serves 6-8, and is common in North American brunch menus.
Nutritionally, this dish provides a balance of protein, carbs, and vegetables. For specific vitamin and mineral values, check the USDA resources for spinach and eggs for authoritative numbers, for example, USDA nutrition data.
Quick Facts about Spinach Feta Breakfast Casserole
- Servings: 6-8
- Bake time: 40 min at 350 degrees F (177 degrees C)
- Primary protein: eggs, approx. 18 g per serving depending on portion
- Key produce: frozen Potatoes O’Brien, 28 oz. bag
Did you know? Spinach loses volume when cooked, so use more raw or frozen leaves than you think to keep the casserole green and nutrient-rich.
Spinach Feta Breakfast Casserole
Ingredients
Base Ingredients
- 14 oz Frozen Potatoes O’Brien 1/2 of a 28 oz. bag
- 1 cup Cooked spinach Use more raw spinach for more nutrition.
Egg Mixture
- 6 large Eggs Approximately 18 g protein per serving
- 1 cup Milk Can be substituted with whole milk or sour cream.
- 1 tsp Salt Adjust based on preference.
- 1/2 tsp Black pepper To taste.
- 1/2 tsp White pepper To taste.
- 1/2 tsp Garlic powder To flavor the egg mixture.
- 2 tbsp Scallions Chopped.
- 1/4 tsp Crushed red pepper flakes Optional.
Topping
- 4 oz Feta cheese Crumbled.
Instructions
Preparation
- Preheat the oven to 350°F (177°C).
- Spray a 9×13 baking dish with cooking spray and spread half of a 28oz bag of frozen Potatoes O’Brien evenly in the dish.
- Sauté spinach in a large skillet with olive oil until wilted, about 3-5 minutes, then spread it over the potatoes.
- In a mixing bowl, combine the eggs, milk, salt, black pepper, white pepper, garlic powder, scallions, and optional crushed red pepper flakes. Whisk together until blended.
- Pour the egg mixture over the potato and spinach mixture, then scatter the crumbled feta evenly over the top.
Baking
- Bake at 350°F for 40 minutes or until the eggs are cooked through with a slight jiggle in the center.
Serving
- Garnish with chives, hot sauce, or your favorite toppings. Let rest for 5 minutes before slicing.
Notes
Nutrition
Step-by-Step Instructions
Follow these steps for reliable results. Each step includes the expected outcome so you can troubleshoot as you go.
- Spray a 9×13 baking dish with cooking spray and spread half of a 28oz. bag of frozen Potatoes O’Brien in the dish.
- Action: Layer frozen potato pieces evenly.
- Expected result: Even base that browns and holds the egg mixture.
- Saute spinach in a large skillet with olive oil until just wilted, about 3-5 minutes. Spread the cooked spinach evenly over the potatoes.
- Action: Quick wilt in medium heat.
- Expected result: Bright green spinach with no excess moisture.
- In a mixing bowl, combine the eggs, milk, salt, black pepper, white pepper, garlic powder, scallions, and optional crushed red pepper flakes. Whisk together until fully incorporated. Pour the egg mixture over the potato/spinach mixture.
- Action: Whisk until blended and slightly frothy.
- Expected result: Even egg distribution, seeds for set texture.
- Scatter the feta crumbles over the egg mixture, making sure they are evenly distributed.
- Action: Top with feta in an even layer.
- Expected result: Pockets of tangy flavor throughout the casserole.
- Bake at 350 degrees for 40 minutes or until the eggs are cooked through.
- Action: Bake in center rack, check at 35 min for doneness.
- Expected result: Firm edges, slight jiggle at center, internal temp near 160 F (71 C).
- Garnish with chives, hot sauce, or your favorite toppings. Enjoy!
- Action: Rest 5 min, then slice.
- Expected result: Clean slices, set center, warmed through.
Variations & Substitutes
This casserole adapts to diets and preferences easily. Swap ingredients to change flavor, time, and nutrition.
- Vegetarian: Replace feta with goat cheese or more veggies.
- Lower sodium: Use low-sodium frozen potatoes and reduced-salt feta, increase herbs for flavor.
- Gluten-free: Recipe is naturally gluten-free if potato mix contains no wheat.
- Add-ins: Cooked bacon or diced ham adds 20-25 g protein per serving, but increases fat and sodium.
Chef tip: For creamier eggs, use 1 cup (240 ml) whole milk or 3/4 cup (180 ml) milk plus 1/4 cup (60 ml) sour cream.
Explore savory breakfast recipes for more casserole-style ideas and protein-forward mains.
Mistakes to Avoid
Common beginner errors with fixes to ensure a perfect bake.
- Using wet spinach, fix: Squeeze excess moisture in a towel.
- Crowding pan, fix: Spread potato and spinach evenly for uniform cooking.
- Undercooking eggs, fix: Bake until center reaches 160 F (71 C).
- Skipping seasoning, fix: Season layers, taste the egg mix.
- Overbaking, fix: Remove when just set, rest 5 min to finish cooking.
Checklist:
1.. Squeeze spinach dry
2.. Check internal temp
3.. Even layers
4.. Season each layer
5.. Rest before slicing
Storage, Reuse
This casserole stores and reheats well, perfect for meal prep. Cool completely, then refrigerate in airtight container for up to 4 days, or freeze portions for up to 2 months. Reheat in a 350 F (177 C) oven for 10-15 minutes from chilled, or microwave single servings for 60-90 seconds.
Quick reuse ideas:
- Slice and serve with yogurt and fruit for a balanced plate.
- Crumble leftover into scrambled eggs or wrap in a tortilla for lunch.
Related Recipes / See Also
If you love this, try other high-protein and sweet breakfast options in our collection.
- High-protein pancakes, perfect for weekend brunch.
- Savory breakfast recipes, more casserole and egg bake ideas.
- Sweet breakfast recipes, for muffins and quick treats.
Conclusion
This Spinach Feta Breakfast Casserole is simple to assemble, flexible to adapt, and forgiving for make-ahead mornings. With clear steps, swaps, and storage tips, you get a reliable, tasty breakfast that feeds a crowd or provides weekday fuel. Enjoy consistent results and less stress at breakfast time.
