This Egg Bake (Overnight Breakfast Casserole) is the perfect dish for any occasion, whether it’s a cozy family breakfast or a festive brunch with friends. Its delicious combination of flavors, textures, and ingredients makes it both satisfying and versatile. You can prepare it ahead of time, freeze it for convenience, or bake it right away. This casserole is sure to impress your guests while keeping your morning routine hassle-free!
Why You’ll Love This Recipe
- Easy to Prepare: With simple steps, you can whip this casserole together in no time.
- Make-Ahead Friendly: Prepare it up to 24 hours in advance or freeze for later use.
- Customizable Ingredients: Swap out veggies or proteins based on what you have on hand.
- Feeds a Crowd: Perfect for gatherings, this recipe serves about 10 people effortlessly.
- Deliciously Flavorful: The blend of eggs, cheese, and fresh vegetables creates a mouth-watering dish.
Tools and Preparation
Before you start cooking, gather the necessary tools to ensure a smooth experience.
Essential Tools and Equipment
- Non-stick spray
- Large skillet
- Casserole dish (7 x 11 or 9 x 13)
- Mixing bowl
- Whisk
Importance of Each Tool
- Non-stick spray: Prevents sticking and makes cleanup easier.
- Large skillet: Ideal for browning sausage and sautéing vegetables evenly.
- Casserole dish: Provides the right size and shape for baking your Egg Bake to perfection.

Ingredients
This overnight breakfast casserole can be baked right away, made up to a day in advance, or frozen for easy entertaining. Completely customizable and great for feeding a crowd!
For the Base
- 10 to 12 ounces (280-340g) sausage (casing removed)
- olive oil
- 2 cloves of garlic (minced)
- 3 cups (90g) fresh spinach
- 2 large bell peppers (diced)
- ½ medium yellow onion (diced)
- salt and pepper (to taste)
For the Egg Mixture
- 12 large eggs
- ½ cup (120g) milk (any)
- ½ cup (56g) shredded cheese (any flavor; divided)
How to Make Egg Bake (Overnight Breakfast Casserole)
Step 1: Prepare Your Dish
Spray a 7 x 11 or 9 x 13 casserole dish with non-stick spray. If you are baking immediately, preheat your oven to 375ºF (191ºC).
Step 2: Cook the Sausage
In a large skillet over medium heat:
1. Add the sausage and cook until browned. If using fully cooked sausage, you may skip this step.
2. Spoon the browned sausage evenly into the prepared casserole dish.
Step 3: Sauté the Vegetables
In the same skillet:
1. Add a little olive oil if needed.
2. Sauté garlic, spinach, bell peppers, and onion until tender—about 6–7 minutes.
3. Season with salt and pepper during the last minute.
Step 4: Combine Ingredients
- Remove from heat and add the vegetable mixture to the sausage in the casserole dish.
- Stir together roughly to ensure an even distribution.
Step 5: Mix Eggs and Cheese
In a medium bowl:
1. Whisk together eggs, milk, and ¼ cup of shredded cheese.
2. Pour this mixture evenly over the sausage and vegetables in the casserole dish.
3. Sprinkle with remaining cheese along with more salt and pepper.
Step 6: Bake Your Casserole
You can either:
– Bake immediately by placing it in your preheated oven.
– Cover with plastic wrap or foil to refrigerate for up to 24 hours before baking later.
When ready:
1. Preheat oven again if previously refrigerated.
2. Bake for approximately 45 minutes or until edges start to brown.
3. Let cool for at least 15 minutes before serving.
Step 7: Storing Leftovers
Store leftovers in the refrigerator for up to five days. Reheat individual servings in the microwave as needed. This baked casserole can also be frozen for up to two months; thaw overnight in the refrigerator before reheating at 350ºF (177ºC) for about 20 minutes until heated through.
Enjoy your delicious Egg Bake (Overnight Breakfast Casserole)!
How to Serve Egg Bake (Overnight Breakfast Casserole)
Serving your Egg Bake (Overnight Breakfast Casserole) can be both fun and creative! This dish is versatile and pairs well with a variety of sides and toppings that enhance its flavor. Here are some great suggestions for serving this delicious breakfast casserole.
Fresh Herb Garnish
- Chopped parsley or chives – Sprinkle freshly chopped herbs on top for a burst of color and flavor.
Salsa or Hot Sauce
- Spicy kick – Serve with your favorite salsa or a dash of hot sauce to add some heat.
Avocado Slices
- Creamy texture – Add slices of avocado on the side for a creamy complement to the casserole.
Mixed Green Salad
- Light balance – A simple salad with mixed greens can provide a refreshing contrast to the warm casserole.
Toast or English Muffins
- Carb addition – Serve with toasted bread or English muffins to soak up any leftover egg goodness.
Fruit Salad
- Sweet contrast – A bowl of fresh fruit salad adds sweetness and freshness, balancing the savory flavors of the casserole.
How to Perfect Egg Bake (Overnight Breakfast Casserole)
To ensure your Egg Bake (Overnight Breakfast Casserole) turns out perfectly every time, consider these helpful tips.
- Use fresh ingredients – Fresh vegetables and high-quality eggs will enhance the flavor and texture of your casserole.
- Customize protein options – Experiment with different proteins like turkey sausage or sautéed chicken for varied flavors.
- Don’t overbake – Keep an eye on the baking time; overcooking can lead to a dry texture. Aim for a slight jiggle in the center when you pull it from the oven.
- Allow resting time – Letting the casserole cool for at least 15 minutes before serving helps it set up nicely, making it easier to cut into squares.
- Make ahead – Preparing it a day in advance not only saves time but allows flavors to meld beautifully overnight.
- Experiment with cheeses – Try different types of cheese such as feta, mozzarella, or pepper jack for unique flavors.
Best Side Dishes for Egg Bake (Overnight Breakfast Casserole)
Pairing side dishes with your Egg Bake (Overnight Breakfast Casserole) can elevate your meal. Here are some excellent choices that complement this dish beautifully.
- Crispy Hash Browns – Golden-brown hash browns offer a satisfying crunch alongside the soft casserole.
- Seasoned Roasted Potatoes – Oven-roasted potatoes seasoned with herbs make a hearty side option.
- Fruit Smoothies – A refreshing fruit smoothie can provide a nutritious drink option that balances out the meal.
- Yogurt Parfaits – Layer yogurt with granola and fruits for a delightful sweet treat that contrasts with savory flavors.
- Baked Beans – Sweet and savory baked beans add protein and fiber, making them an excellent accompaniment.
- Pancakes or Waffles – For those who enjoy sweet breakfast options, fluffy pancakes or waffles can round out your brunch spread.
- Grilled Tomatoes – Lightly grilled tomatoes provide acidity that enhances the richness of the casserole.
- Oatmeal Bowl – A warm oatmeal bowl topped with fruits and nuts offers comforting warmth alongside your egg bake.
Common Mistakes to Avoid
When preparing your Egg Bake (Overnight Breakfast Casserole), avoiding common pitfalls can enhance your dish significantly.
- Skipping the browning step: Not browning the sausage may lead to a lack of flavor. Always brown the sausage for more depth.
- Overloading with vegetables: Adding too many veggies can make your casserole watery. Stick to the recommended amounts for best results.
- Not seasoning properly: Failing to season your egg mixture can leave your dish bland. Don’t forget to add salt and pepper!
- Ignoring resting time: Cutting into the casserole immediately after baking can result in a messy serving. Allow it to rest for at least 15 minutes before cutting.
- Using low-quality eggs or milk: Poor ingredients can affect the overall taste and texture. Always choose fresh, high-quality eggs and milk for the best outcome.
Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container.
- Keep in the refrigerator for up to 5 days.
Freezing Egg Bake (Overnight Breakfast Casserole)
- Wrap tightly in plastic wrap and foil.
- Freeze for up to 2 months.
Reheating Egg Bake (Overnight Breakfast Casserole)
- Oven: Preheat to 350ºF (177ºC) and bake for about 20 minutes until heated through.
- Microwave: Place a single serving on a microwave-safe plate and heat in short bursts of 30 seconds until warm.
- Stovetop: Heat slices in a skillet over low heat, covering to retain moisture.
Frequently Asked Questions
Here are some common questions about making an Egg Bake (Overnight Breakfast Casserole).
Can I customize the ingredients?
Yes! Feel free to substitute vegetables or proteins based on your preferences.
How long does it take to prep this casserole?
The prep time is approximately 20 minutes, making it a quick option for busy mornings.
Can I prepare it ahead of time?
Absolutely! You can assemble it the night before and refrigerate until you’re ready to bake.
What type of cheese works best?
Any cheese you enjoy will work well, such as cheddar, mozzarella, or feta.
Final Thoughts
This Egg Bake (Overnight Breakfast Casserole) is not only delicious but also incredibly versatile. With endless customization options, it’s perfect for brunches or busy weekday mornings. Try it out today!
Egg Bake (Overnight Breakfast Casserole)
- Prep Time: 20 minutes
- Cook Time: 45 minutes
- Total Time: 1 hour 5 minutes
- Yield: Serves approximately 10 people 1x
- Category: Breakfast
- Method: Baking
- Cuisine: American
Description
Enjoy a delicious Egg Bake (Overnight Breakfast Casserole) that’s easy to prepare ahead of time. Perfect for brunch—try this recipe today!
Ingredients
- 10 to 12 ounces of turkey sausage (casing removed)
- Olive oil
- 2 cloves garlic (minced)
- 3 cups fresh spinach
- 2 large bell peppers (diced)
- ½ medium yellow onion (diced)
- 12 large eggs
- ½ cup milk
- ½ cup shredded cheese
Instructions
- Preheat your oven to 375ºF (191ºC) and spray a casserole dish with non-stick spray.
- In a large skillet over medium heat, brown the turkey sausage until cooked through. Transfer to the prepared dish.
- Sauté garlic, spinach, bell peppers, and onion in the same skillet until tender. Season with salt and pepper.
- Combine the vegetable mixture with the sausage in the casserole dish.
- In a bowl, whisk together eggs, milk, and cheese. Pour over the sausage and vegetables in the dish.
- Bake for approximately 45 minutes or until golden brown around the edges.
Nutrition
- Serving Size: 1 slice (approximately 100g)
- Calories: 220
- Sugar: 2g
- Sodium: 450mg
- Fat: 14g
- Saturated Fat: 5g
- Unsaturated Fat: 8g
- Trans Fat: 0g
- Carbohydrates: 7g
- Fiber: 1g
- Protein: 15g
- Cholesterol: 210mg