Are you tired of rushing through breakfast every morning? Do you wish you could enjoy a delicious, hearty meal without the hassle of cooking from scratch? Look no further! This Make Ahead Breakfast Casserole is your solution. Packed with flavor and nutritious ingredients, it’s the perfect dish for busy mornings, brunch gatherings, or even a cozy weekend breakfast. Plus, it’s easy to prepare in advance, allowing you to savor your mornings without the stress of cooking. Let’s dive into why this dish is a favorite among home cooks and how you can make it your own.
Why Cooks Rave About It

The Make Ahead Breakfast Casserole has become a staple in kitchens across the globe for several reasons:
– **Convenience**: Prepare it the night before and simply bake it in the morning.
– **Flavorful**: The combination of savory sausage, fresh vegetables, and creamy eggs creates a delightful taste explosion.
– **Versatile**: You can easily customize it with your favorite ingredients, making it suitable for any palate.
– **Feeding a Crowd**: It’s perfect for family gatherings or brunch with friends, feeding many without much effort.
– **Nutritious**: Packed with protein and veggies, it’s a wholesome start to the day.
It’s no wonder that this dish has earned rave reviews from cooks everywhere!
What Goes Into Make Ahead Breakfast Casserole
To whip up this delicious Make Ahead Breakfast Casserole, you’ll need the following ingredients:
- 1 pound pork breakfast sausage
- 1/2 red onion, diced
- 1 fennel bulb, chopped
- 1 teaspoon kosher salt, divided
- 5 ounces fresh baby spinach
- 12 eggs
- 1/4 cup milk
- 1/4 teaspoon ground black pepper
Each ingredient plays a crucial role in creating a flavorful and satisfying dish that you and your family will love!
Hardware & Gadgets
Before you start cooking, gather the necessary tools to make your experience smooth and enjoyable:
- Large skillet: For cooking the sausage and vegetables.
- Mixing bowl: To whisk together the eggs and milk.
- 9×13 inch baking dish: Ideal for baking your casserole.
- Whisk: For mixing the eggs and milk thoroughly.
- Spatula: To stir and serve the casserole.
Having these tools on hand will help you breeze through the cooking process, ensuring a delightful experience.
Cooking Make Ahead Breakfast Casserole: The Process

Now, let’s get into the nitty-gritty of making this Make Ahead Breakfast Casserole. Follow these simple steps to create a breakfast masterpiece:
Step 1: Preheat Your Oven
Preheat your oven to 350°F (175°C). This ensures that your casserole bakes evenly and thoroughly.
Step 2: Cook the Sausage
In a large skillet over medium heat, crumble and cook the 1 pound of pork breakfast sausage until browned and fully cooked. This should take about 5-7 minutes. Use a spatula to break it apart as it cooks.
Step 3: Sauté the Vegetables
Add the diced red onion and chopped fennel bulb to the skillet with the sausage. Sauté for another 5 minutes until the vegetables are softened and fragrant. Season with 1/2 teaspoon of kosher salt.
Step 4: Add the Spinach
Toss in the fresh baby spinach and stir until wilted, about 2 minutes. Remove the skillet from heat and allow the mixture to cool slightly.
Step 5: Whisk the Eggs
In a large mixing bowl, whisk together the 12 eggs, 1/4 cup of milk, 1/2 teaspoon of kosher salt, and 1/4 teaspoon of ground black pepper until well combined.
Step 6: Combine Ingredients
Add the sausage and vegetable mixture to the egg mixture, stirring until everything is evenly distributed.
Step 7: Bake the Casserole
Pour the mixture into a greased 9×13 inch baking dish, spreading it out evenly. Bake in the preheated oven for 30-35 minutes, or until the center is set and the top is lightly golden.
Step 8: Cool and Serve
Once baked, allow the casserole to cool for a few minutes before slicing into squares. Serve warm and enjoy your delicious Make Ahead Breakfast Casserole!
Healthier Substitutions

If you’re looking to make your Make Ahead Breakfast Casserole a bit lighter or cater to specific dietary needs, consider these substitutions:
- Turkey sausage: Swap pork sausage for turkey sausage for a leaner option.
- Egg whites: Use egg whites instead of whole eggs to reduce cholesterol.
- Plant-based milk: Replace cow’s milk with almond or oat milk for dairy-free options.
- Additional veggies: Add bell peppers, zucchini, or mushrooms for more nutrients.
These alternatives can help you tailor the recipe to fit your preferences while still keeping it delicious.
Avoid These Traps
When making your Make Ahead Breakfast Casserole, be mindful of the following pitfalls:
- Overcooking the sausage: Ensure it’s browned but not burnt to maintain flavor.
- Undercooked eggs: Always check that the center is fully set before removing from the oven.
- Skipping the cooling step: Letting it cool slightly before slicing prevents messy servings.
- Not greasing the baking dish: This can lead to sticking, making serving difficult.
By avoiding these common mistakes, you’ll ensure a perfect casserole every time.
Refrigerate, Freeze, Reheat
One of the best parts about the Make Ahead Breakfast Casserole is its storage versatility:
- Refrigerate: Store leftovers in an airtight container in the fridge for up to 4 days.
- Freeze: Wrap slices in plastic wrap and place them in a freezer-safe bag for up to 3 months.
- Reheat: To reheat, thaw overnight in the refrigerator, then warm in the oven at 350°F (175°C) for about 15-20 minutes.
This flexibility makes it an ideal choice for meal prep and busy schedules!
Helpful Q&A
Can I use different types of sausage in this casserole?
Absolutely! You can use any variety of sausage you prefer. Just be sure it’s fully cooked before adding it to the casserole.
How can I make this casserole vegetarian?
For a vegetarian version, omit the sausage and increase the amount of vegetables, or add in your favorite plant-based protein.
Can I prepare this casserole the night before?
Yes! Prepare the casserole up to the baking step, cover it tightly, and refrigerate overnight. Bake it in the morning for a quick breakfast.
What can I serve with the casserole?
This casserole pairs beautifully with fresh fruit, a light salad, or a side of whole grain toast for a complete breakfast.
Don’t Miss These
If you enjoyed this Make Ahead Breakfast Casserole, be sure to check out these delicious recipes:
Each of these recipes offers a unique twist on breakfast that you won’t want to miss!
In Closing
The Make Ahead Breakfast Casserole is a game-changer for anyone looking to simplify their breakfast routine. With its combination of savory sausage, fresh veggies, and creamy eggs, it’s a dish that pleases everyone at the table. Whether you’re preparing for a busy week or hosting friends for brunch, this casserole makes mornings easy and enjoyable. So, roll up your sleeves, gather your ingredients, and give this recipe a try. You won’t be disappointed!

Make Ahead Breakfast Casserole
Ingredients
- 1 pound pork breakfast sausage
- 1/2 red onion, diced
- 1 fennel bulb, chopped
- 1 teaspoon kosher salt, divided
- 5 ounces fresh baby spinach
- 12 eggs
- 1/4 cup milk
- 1/4 teaspoon ground black pepper
Instructions
- Preheat your oven to 350°F (175°C).
- In a large skillet over medium heat, crumble and cook the pork breakfast sausage until browned and fully cooked, about 5-7 minutes.
- Add the diced red onion and chopped fennel bulb to the skillet with the sausage. Sauté for another 5 minutes until softened and fragrant. Season with 1/2 teaspoon of kosher salt.
- Toss in the fresh baby spinach and stir until wilted, about 2 minutes. Remove from heat and allow to cool slightly.
- In a large mixing bowl, whisk together the eggs, 1/4 cup of milk, 1/2 teaspoon of kosher salt, and 1/4 teaspoon of ground black pepper until well combined.
- Add the sausage and vegetable mixture to the egg mixture, stirring until evenly distributed.
- Pour the mixture into a greased 9x13 inch baking dish, spreading it out evenly. Bake for 30-35 minutes, or until the center is set and the top is lightly golden.
- Allow the casserole to cool for a few minutes before slicing into squares. Serve warm.
Equipment
- Large Skillet
- Mixing Bowl
- 9x13 inch Baking Dish
- Whisk
- Spatula
Notes
- Store leftovers in an airtight container in the fridge for up to 4 days.
- Freeze slices for up to 3 months for convenient meal prep.
- Reheat in the oven at 350°F for 15-20 minutes for best results.
