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Holiday Cooking | September 20, 2023

Overnight Croissant Breakfast Bake

Overnight Croissant Breakfast Bake

If you love the ease of breakfast casseroles, you need this recipe for Overnight Croissant Breakfast Bake in your life ASAP! Sausage, onions, sautéed spinach, eggs, and buttery croissants all topped with melty cheese. You have officially died and gone to breakfast casserole heaven!

Overnight Croissant Breakfast Bake

I love a good breakfast casserole. What’s not to love about waking up, turning on the oven and about an hour later pulling this out of the oven?!

Of all the breakfast casserole recipes I have on A Bountiful Kitchen, this one is my favorite, and I believe the best breakfast casserole recipe!

The best breakfast casserole

You may be wondering why I use croissants in this breakfast casserole? The trouble with many breakfast casseroles is they look decent when pulled right out of the oven, but quickly deflate into a flat dish that looks less than appetizing. Our Overnight Croissant Breakfast Bake is everything you love in breakfast foods all combined into one beautiful delicious dish.

favorite breakfast bake

This recipe takes overnight casseroles to the next level. When I first started making breakfast casseroles in the 80’s, recipes often instructed to butter slices of bread, which made the casserole buttery and delicious. The croissants mimic the buttered bread, but in a next-level way! The flaky layers of croissants soaked in eggs and half and half are similar to a rich bread pudding texture I know you will love!

How to make this easy Breakfast Casserole:

  1. Tear the croissants into pieces and place in a greased 9×13 dish.
  2. Brown the sausage, drain grease and place on top of croissants in dish.
  3. Cook the onion and spinach, pour on top of sausage, top with cheese.
  4. Beat the eggs, half and half and add seasonings.
  5. Pour over cheese in pan.
  6. Cover with foil, refrigerate overnight.
  7. Preheat oven, bake 30 minutes with foil on top, 30 minutes without.
  8. Let cool, top with chili sauce

Ingredients needed for Overnight Croissant Breakfast Bake:

  • 4-6 large croissants (day old are best)
  • 1 lb Italian or spicy sausage
  • 2 cups chopped onion
  • 1-2 cups fresh spinach
  • 2 cups grated Cheddar Monterey Jack, Pepper Jack, Mozzarella, or a combo
  • 12 large eggs
  • 1 1/2 cups half and half
  • 1 teaspoon dry mustard

We like to serve this with sweet rolls, fresh fruit and cocoa!

This recipe originally posted in 2014, updated with new photos and content September, 2023.

5 from 2 votes

Overnight Croissant Breakfast Bake

This easy to make breakfast casserole is my favorite of all the breakfast casseroles! Simple yet delicious with a bit of onions and spinach for color and flavor. The croissants take this ordinary breakfast casserole over the top!

Course Breakfast, brunch
Cuisine American
Keyword breakfast casserole, croissant, eggs, overnight recipe
Prep Time 15 minutes
Cook Time 1 hour
refrigeration 8 hours
Total Time 9 hours 15 minutes
Servings 12
Author Si Foster


  • 4-6 large croissants day old are best
  • 1 lb Italian or spicy sausage you may use more if desired
  • 2 cups chopped onion
  • 1-2 cups fresh spinach
  • 2 cups grated Cheddar Monterey Jack, Pepper Jack, Mozzarella, or a combo
  • 12 large eggs
  • 1 1/2 cups half and half
  • 1 teaspoon dry mustard
  • 1 teaspoon salt
  • 1 teaspoon pepper ground pepper


  1. Grease a 9×13 or large casserole dish.
  2. Tear the croissants into large chunks and lay in pan close together. The rolls should cover the bottom of the pan.
  3. Brown the sausage in a Teflon frying pan, drain grease and place cooked sausage in a dish lined with paper towels to collect any extra grease. Press the paper towels around the sausage to squeeze out any remaining grease. Pour the meat on top of the croissants in dish, distribute evenly.
  4. Using the pan the meat was cooked in, wipe out pan with a paper towel and place the pan back on the stove at medium high heat. Cook the chopped onion for about 5 minutes or until softened, add one tablespoon oil or butter if needed. Add spinach to pan and cook just until the spinach is wilted. Pour cooked onions and spinach over top of sausage. Top with grated cheese.
  5. Beat the eggs and half and half together in a blender or bowl. Add the dry mustard, salt and pepper.
  6. Pour this mixture over the rolls in the pan. Cover with foil that has been greased (on side facing eggs) and store overnight in refrigerator.
  7. The next morning, remove casserole from fridge, preheat oven to 375 and place rack in middle of oven.
  8. Bake covered for 30 minutes, then carefully remove foil and bake until top is slightly puffed and custard is set in center, about 30 minutes more.
  9. Let cool for about 10 minutes, cut into 12 squares and serve immediately with chili sauce and or salsa.

Recipe Notes

-The meat may be cooked and kept in fridge for up to three days before assembling. Or you may cook meat and freeze ahead of time.

8 thoughts on “Overnight Croissant Breakfast Bake

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Recipe Rating

  1. Made this a few days after Christmas but used kale since I had no spinach. Amazing recipe! I even used it as inspiration to make mini muffin portions for an office breakfast. Thank you!

  2. 5 stars
    I have made this several times and each time it just gets better and better! I added some bacon in the last time and only did 1 cup of onion and my husband said it was the best one yet because, who doesn’t love bacon?

    1. Exactly, Brenna! Bacon makes everything better and I love that idea of adding it to this recipe. Thanks for sharing!

  3. 5 stars
    Made this for another successful holiday breakfast from A Bountiful Kitchen! Any recipe that I choose from this website has been a hit!! This Christmas we did the Overnight Breakfast Berry Bake With Caramel Syrup and Overnight Croissant Breakfast Bake. Sooooo delicious!! She truly has a gift of making easy recipes that are amazing and make average cooks like me look good every time!

    1. Hi Kelly, I’m so glad you enjoyed the recipe, and that Berry Bake is a perfect way to compliment the savory in this dish. Thank you for sharing and for reading ABK!