Start your morning off right with this mouthwatering Croissant Breakfast Casserole—deliciously rich, incredibly filling, and a breeze to prepare!
This Croissant Breakfast Casserole is a hearty and delicious way to start your morning and keep you energized during the day. It is filled with croissants, sausage, spinach, cheese, eggs, and so much more. It’s ideal to make this recipe the night before to let the croissants soak up all the flavor. Then pop it in your oven the next morning and all it has to do is cook and you have a delicious breakfast at your fingertips!
I love to serve this croissant sausage casserole alongside my Mini Pancakes, and Fruit Salad for a well rounded breakfast.
Table of Contents
Why We Love Breakfast Casserole
- Just toss everything together, bake, and you’ve got a complete breakfast without the fuss.
- It’s perfect for brunch or family gatherings.
- It’s also great for leftovers and reheats well for another meal.
Recipe Ingredients
Pork Sausage – Brings a savory, rich flavor with a slightly crumbly texture.
Cheddar Cheese – Adds a sharp, tangy taste and a creamy, gooey texture when melted.
Dry Mustard – Gives a mild heat and a hint of tangy undertone.
For a full list of ingredients and amounts, see the recipe card below.
Variations
Meat Alternative – Swap the sausage for bacon, breakfast sausage, or ham to bring in a different savory twist.
Cheese Swap – Replace cheddar and Monterey Jack with Swiss, mozzarella, or Gruyere cheese for a creamy, rich, slightly nutty flavor.
Veggie Addition – Add veggies like broccoli, mushrooms, bell peppers, or sun-dried tomatoes for extra flavor and nutrition.
How to Make Croissant Breakfast Casserole
Step 1: In a large skillet, brown the sausage over medium heat until fully cooked. Transfer the sausage to a paper towel-lined plate. Remove the grease by slightly patting it with the paper towels, then place it in a medium mixing bowl. Wipe the pan out a bit, then sauté the onion until translucent, add the spinach and wilt. Add to the bowl with the sausage, then toss with the cheese and cubed croissants. Spread into the bottom of an 8×8-inch baking pan.
Step 2: In a medium mixing bowl, whisk together the eggs, then add and whisk in the milk, half and half, mustard, salt, black pepper, paprika, and garlic powder. Pour over the egg mixture in the pan, taking care to soak the tops of all of the croissant pieces. Cover and refrigerate for at least 8 hours, preferably overnight.
Step 3: Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius). Bake uncovered for 45-50 minutes or until the center is set and the tops are golden brown. Remove from the oven and allow to rest for 10 minutes before serving.
Expert Tips
Tent with Foil if Browning Too Quickly – If the top of your Sausage Croissant Breakfast Casserole starts browning too fast, cover it with foil for the last 10-15 minutes to prevent burning while allowing the center to cook through.
Add Fresh Herbs for Extra Flavor – Sprinkle fresh chopped herbs like parsley, thyme, rosemary, sage, or chives over the casserole before baking. It adds a layer of fresh flavor and a touch of color.
Use Quality Croissants – Go for medium to large bakery croissants; their fabulous flaky layers soak up the custard beautifully.
FAQs
Yes, you can double this recipe. Use a 9×13-inch baking dish or pan and bake for 50-60 minutes. To ensure even cooking, check for doneness by inserting a toothpick in the center; it should come out clean.
This recipe is already very quick, but you can speed it up by using leftover hamburger meat or pre-cooked sausage/bacon.
I recommend making it the night before baking so that the bread can soak up all the goodness and flavor! If you are making it the morning of, let the bread sit for at least 20-30 minutes before popping it in the oven. If the bread isn’t soaked through enough, there’s a chance of it burning or becoming really hard and crunchy in the casserole.
Storage Info
To STORE the Sausage Croissant Breakfast Casserole leftovers, place them in an airtight container and cover them tightly. You can refrigerate it for up to 3 days. To FREEZE, wrap it well with plastic wrap and aluminum foil, then freeze for up to 3-6 months.
To REHEAT, thaw overnight in the fridge if frozen, then bake at 350°F (175°C) for 20-25 minutes, or until heated through. Individual portions can be microwaved for 1-2 minutes until warm.
More Breakfast Casseroles to Try
Croissant Breakfast Casserole Recipe
Ingredients
- 1/2 lb regular pork sausage
- 1/2 small onion - or 1 large leek, diced
- 1 cup fresh spinach - roughly chopped
- 1/2 cup cheddar cheese - grated
- 1/2 cup monterey jack cheese - grated
- 3 large croissants - cut or torn into 1-2 inch cubes
- 6 large eggs
- 3/4 cup whole milk
- 1/2 cup half and half
- 3/4 tsp dry mustard
- 1/2 teaspoon salt
- 1/2 tsp ground black pepper
- 1/4 tsp paprika
- 1/8 tsp garlic powder
Instructions
- In a large skillet, brown the sausage over medium heat until fully cooked. Transfer the sausage to a paper towel-lined plate. Remove the grease by slightly patting it with the paper towels, then place it in a medium mixing bowl. Wipe the pan out a bit, then sauté the onion until translucent, add the spinach and wilt. Add to the bowl with the sausage, then toss with the cheese and cubed croissants. Spread into the bottom of an 8×8-inch baking pan.
- In a medium mixing bowl, whisk together the eggs, then add and whisk in the milk, half and half, mustard, salt, black pepper, paprika, and garlic powder. Pour over the egg mixture in the pan, taking care to soak the tops of all of the croissant pieces. Cover and refrigerate for at least 8 hours, preferably overnight.
- Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius). Bake uncovered for 45-50 minutes or until the center is set and the tops are golden brown. Remove from the oven and allow to rest for 10 minutes before serving.
Does doubling the recipe change the amount of time it needs to bake? Do you double everything including the spices? Thank you!
I would be interested in this information as well since I’d love to make this for work in a 13″x9″ pan.
It looks delicious!
Oops, I just saw the end note.
Thanks for a great recipe!! I’ll be making it soon!!
I love an overnight breakfast casserole and have made several. This one is by far my favorite. Made it Christmas morning with a fresh fruit salad and I was a hero….Thanks
So happy to hear that! Thanks for sharing Suzy, happy holidays!
We made this and my family LOVED it! It’s filling, and incredibly easy to make! Thanks for the great recipe 🙂
Thanks Whitney! Our family loves them too!!
Great idea! Beautiful pictures.
Thank you Megan!
Wow. I want to eat this for breakfast everyday!