If you’re looking for a delicious, hearty breakfast that requires minimal effort in the morning, an Overnight Breakfast Casserole is exactly what you need. This make-ahead dish is a crowd-pleaser, perfect for holidays, brunch gatherings, or lazy weekends when you want something warm and satisfying without the hassle.
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What is Overnight Breakfast Casserole?
An Overnight Breakfast Casserole is a baked egg dish filled with layers of sausage, vegetables, cheese, and either bread or potatoes. The magic happens overnight in your refrigerator, where all the ingredients soak and blend together. In the morning, simply bake and enjoy! It’s the ultimate comfort food with minimal morning prep.
Why You’ll Love It
- Time-Saving: Prep it the night before and bake in the morning.
- Customizable: Add your favorite meats, cheeses, or veggies.
- Feeds a Crowd: Serves 12 — great for gatherings or weekly meal prep.
- Nutrient-Packed: Includes protein, veggies, and healthy fats.
- Delicious Anytime: Great for breakfast, brunch, or even dinner.
Recipe Variations
Want to make it your own? Here are some popular tweaks:
- Veggies: Add more veggies or different veggies, like mushrooms or spinach. Use your favorite kind of cheese, if you’d like!
- Use Bread Instead of Potatoes if you prefer a fluffier, more traditional casserole texture.
- Try Different Cheeses like cheddar, Swiss, or feta for a flavor twist.
- Add Spice with jalapeños or crushed red pepper.
- Salsa: Substitute salsa for the green chilies.
Serving Suggestions
- Serve with a side of fresh fruit or a green salad.
- Top with hot sauce or salsa for an extra kick.
- Add a slice of toast or warm biscuits to complete the meal.
- Enjoy with coffee, orange juice, or even a breakfast mimosa!
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Ingredients
(yields 12 servings)
- Cooking spray
- 1/2 (32 oz) bag frozen diced hash brown potatoes
(Or substitute with 8 slices white bread, crusts removed) - 1 pound sausage, (your favorite meat)
- 1 red bell pepper, chopped
- 1 yellow bell pepper, chopped
- 1/2 cup chopped onion
- 2 cloves garlic, minced
- 1/2 teaspoon dried oregano
- 4 cups fresh spinach
- 4 oz Monterey Jack cheese, shredded
- 12 large eggs
- 2/3 cup whole milk
- 2 teaspoons Dijon mustard
- 1/2 teaspoon salt
- 1/4 teaspoon freshly ground black pepper
How to Make Overnight Breakfast Casserole
1. Prepare the Base
- Spray a 9×13-inch baking dish with cooking spray. Spread hash browns (or bread) evenly on the bottom.
2. Cook the Sausage & Veggies
- In a large skillet over medium heat, cook sausage until browned. Drain excess fat.
- Add bell peppers, onion, garlic, and oregano to skillet.
- Continue cooking until vegetables are tender and sausage is no longer pink, about 5 minutes.
- Add spinach, cook until wilted, about 1 minute.
3. Assemble the Layers
- Spread the sausage and veggie mixture over the hash browns. Sprinkle shredded cheese on top.
4. Mix the Eggs
- In a large bowl, whisk together eggs, milk, mustard, salt, and pepper. Pour evenly over the casserole.
5. Refrigerate Overnight
- Cover the dish with foil or plastic wrap and refrigerate overnight (at least 8 hours).
6. Bake in the Morning
- Preheat oven to 350°F (175°C). Remove casserole from the fridge and let it sit at room temperature for 20 minutes.
- Bake uncovered for 50–60 minutes, or until the center is set and the top is golden.
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Make Ahead & Storage Tips
- Make Ahead: Fully assemble and refrigerate the night before.
- Storage: Store leftovers in an airtight container in the fridge for up to 4 days.
- Freezing: Freeze individual slices for up to 2 months. Reheat in the microwave or oven.
Nutrition Per Serving
- Calories: 357
- Carbohydrates: 16g
- Protein: 18g
- Fat: 25g
- Saturated Fat: 8g
- Cholesterol: 228mg
- Sodium: 775mg
- Potassium: 488mg
- Fiber: 2g
- Sugar: 2g
Note: Nutrition information is automatically calculated, so should only be used as an approximation.
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Final Thoughts
- This Overnight Breakfast Casserole is the definition of effortless comfort food. It’s flavorful, filling, and perfectly suited for busy mornings or special occasions. The flexibility of this recipe also makes it easy to cater to different dietary needs. Whether you’re cooking for family, guests, or just yourself — this dish always delivers.
- Don’t forget to check out our recommended kitchen tools and recipes on our website, myhomewish.com, to streamline prep and elevate your cooking game.