Easy And Delicious Croissant Breakfast Casserole

Recipe Pin
1 hour
6 servings

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Punctuated with ham, Swiss, and honey, this most delicious Croissant Breakfast Casserole is perfect for lazy weekends and holiday brunches!

A baking dish with melted cheese and ham on top of toasted croissants. A spoon drips sauce onto the dish, with a pot visible in the background.

Hosting brunch for just yourself or a whole crowd just got easier with this mouthwatering easy breakfast casserole! The prep time is minimal, making it that lazy cook’s dream come true. Tender and flaky quality croissants, oven-crisped ham, and a delightful blend of Swiss and Parmesan cheeses, all nestled in a pretty pan with a creamy custard of eggs, herbs, and heavy cream. Serve with a bowl of mixed berries or other fruit and BAM, you’ve got breakfast! This indulgent dish is equally perfect for a slow Sunday morning or a special holiday brunch, effortlessly serving six hungry guests with a burst of sweet and savory flavors every bite. Trust me, you’ll want to make this again and again!

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Making this croissant breakfast casserole for yourself is a breeze, offering a stress-free way to treat yourself to a luxurious brunch at home. Plus, the ability to conveniently freeze leftover portions or use them for meal prep throughout the week adds another layer of appeal, making mornings easier and more enjoyable. Whether it’s a quick reheat for a weekday breakfast or a leisurely brunch with friends, this casserole is a versatile addition to your meal-planning toolkit.

Croissants are torn and layered with ham and two cheeses, then baked in a rich custard of eggs and heavy cream. After baking, drizzle a warm honey butter mixture with herbs over the casserole to enhance its flavors.  My method for baked home fries perfectly complements this casserole. You can adapt the method by excluding the eggs and toast, focusing solely on the home fries (and sausages if desired), while maintaining the original baking time.

A close-up of a Croissant Breakfast Casserole being lifted with a spoon, showcasing melted cheese, ham, and herbs.
a pink circle with a 'J' inside representing the logo or branding for Not Entirely Average southern food blog

Why You’ll Love this Breakfast Casserole

·         Delightful Aromas – Wake up to the tantalizing aromas of this flavorful and hearty breakfast casserole. 
·         Complements Other Breakfast Foods – This casserole pairs perfectly with various sides, from crispy bacon to fresh berries.
·         Sweet and Savory Balance – The herby honey butter drizzle adds a perfect touch of sweetness to complement the savory flavors. 
·         Versatile Dish – Perfect for lazy weekends, holiday gatherings, and delightful brunches with friends and family.

Ingredients for A Croissant Casserole

Eggs, honey, Swiss cheese, Dijon mustard, butter, rosemary sprigs, thyme sprigs, various seasonings, deli ham slices, Parmesan cheese, and heavy cream on a marble surface.

  • Croissants – For this recipe, you don’t need fancy French bakery croissants; grab a large package of 8 prepared fresh croissants from the grocery store. Day-old croissants are optimal.
  • Ham – When available, opt for rosemary ham, folding a single slice in half and then rolling it into a rosette shape for a lovely touch.
  • Swiss and Parmesan Cheeses – Swiss cheese offers a nutty, rich taste, while Parmesan adds a slightly milder flavor. Both melt beautifully in the casserole.
  • Eggs and Heavy Cream – Form the creamy custard base, keeping the croissants moist and adding a tender texture.
  • Rosemary and Thyme – This recipe’s fresh herbs work wonders, complementing the other flavors beautifully.
  • Dijon Mustard – For a hint of heat.
  • Honey – Adds subtle sweetness, elevating the dish and introducing the ‘sweet’ in sweet and savory.
  • Butter – Combine with honey for the drizzle and use more to grease the baking dish.
  • Kosher Salt, Garlic Powder, and Black Pepper – Season and enhance the overall taste.
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See recipe card below for a full list of ingredients and measurements.


Three golden, flaky croissants are arranged on a white plate.

Substitutions and Variations

  • I’ve tested this recipe many, many times and can say with certainty that Gruyere cheese works well in place of Swiss if preferred. For that matter, sharp cheddar cheese is lovely, too.
  • I have also gone meatless on occasion, stuffing halved mushrooms, green onions, and olives in and around bite-size pieces of croissant. 
  • I also doubled this recipe for a baby shower once, using turkey in lieu of ham and cream cheese slices instead of hard cheese.
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This recipe has not been tested with other substitutions or variations. If you replace or add any ingredients, please let us know how it turned out in the comments below!


Small glass bowls on a marble surface containing sliced cheese, grated cheese, eggs, a liquid, a square of butter, and fresh herbs.

Step By Step Instructions

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Tip: Use Day Old Croissants

A soft fresh croissant will result in a soggy casserole.


1. Buttered baking dish 2. Plate of croissants 3. Bowl with eggs, milk, and spices 4. Whisk

Step 1: Preheat the oven to 350°F. Grease a 9 x 13-inch baking dish using 1 tablespoon of unsalted butter.

Step 2: Microwave 6 to 8 croissants for 15 to 20 seconds, just until they’re steamy. Set aside to cool while you make the egg custard.

Step 3. To a large bowl, add 4 large eggs, 1/2 cup of heavy cream, and 1 tablespoon Dijon mustard. Season the mixture with 1 teaspoon each of kosher salt, garlic powder, and black pepper and whisk again until smooth.

Step 4. Add 2 tablespoons of fresh chopped herbs to the egg mixture (I’m using rosemary and thyme) and whisk again until silky.

Step-by-step images:

- Croissants being cut.
- Croissants dipped in an egg mixture.
- Ham added to croissants.
- Cheese sprinkled on top.

Step 5. Tear or cut the croissants into thirds or smaller bite-sized pieces if preferred.

Step 6. Dunk each piece into the egg custard before arranging them randomly in the prepared baking dish. Pour any remaining egg custard over the arranged croissants.

Step 7. Pinch the ham slices into bundles or fold and roll them into rosettes. Tuck them in between the hunks of croissant, followed by the Swiss cheese. Add whole rosemary leaves the same way, making the arrangement look pretty.

Step 8. Sprinkle with freshly grated or shaved Parmesan cheese. Bake the casserole for 45-55 minutes until the top is golden brown and the eggs are set.

The image is split into two sections: 

- Left: A spoon stirring a pot of melted butter.
- Right: Close-up of a cheesy baked dish featuring ham, herbs, and layered ingredients suggestive of a Croissant Breakfast Casserole.

Numbers 9 and 10 are overlaid on the respective sections.

Step 9. While the casserole bakes, prepare the herby honey butter by warming equal parts (1/2 cup) unsalted butter and honey in a saucepan atop the stove. Stir together and stir in 1/2 tablespoon fresh minced rosemary and thyme. During the last 15 minutes of the bake, baste the honey butter over the top of the casserole like you would a glaze. Do this several times, allowing it to caramelize each time it’s basted and placed back into the oven.

Step 10. Let it cool for a few minutes before slicing and serving with remaining honey butter drizzled or tableside. Serve with a mélange of fresh blueberries, raspberries, or melon. Enjoy your sweet and savory croissant breakfast casserole!

How to Serve Croissant Breakfast Casserole

Occasions

  • This croissant breakfast casserole is a versatile star, fitting for lazy weekend mornings, holiday gatherings, Christmas morning celebrations, and delightful brunches with friends.
  • It pairs perfectly with fresh berries, crispy bacon, sweet and savory breakfast potatoes, and a generous serving of freshly brewed coffee and orange juice.

Wine and Cocktail Pairings 

  • For an extra touch of sophistication, consider serving this delectable casserole with a crisp mimosa or a light beer, perfectly complementing its rich and flavorful profile.
Freshly baked croissants with melted cheese and ham, topped with herb-infused melted butter.

Making Ahead, Storage, and Reheating

This dish may be made ahead. Cover the dish with foil and let it sit in the refrigerator by several hours or overnight if prepared beforehand. When ready to bake, remove the casserole from the fridge and let it sit at room temperature while the oven preheats. Resume the recipe instructions and cook time.

Wrap leftovers tightly with plastic wrap, then refrigerate for up to 3 days. To reheat, place in an oven preheated to 350F for 15-20 minutes or until heated through.

To freeze, allow to cool completely, then wrap tightly with aluminum foil and freeze for up to 2 months. To thaw, simply place the casserole in the refrigerator overnight. To reheat, bake the casserole at 350F for 30-35 minutes, or until heated through.

Jenny’s Recipe Pro Tips

  • Use day-old croissants for better texture and absorption of the custard.
  • Choose high-quality ingredients, including fresh eggs, milk, and cheese, for the best flavor.
  • Take your time when tucking in the ham rosettes, Swiss, and rosemary leaves – it emerges from your oven looking exactly like how it went in, so making it visually appealing is important!

Recipe FAQs

What can I use as a substitute for heavy cream?

Half and half, whole milk, or 2% milk will work in this recipe.

Can I use bread instead of croissants?

Yes, you can use bread as a substitute for croissants, but keep in mind that the texture and flavor will be different. Croissants add a buttery and flaky texture to the casserole, so using bread will result in a less rich dish. Opt for day old baguette, challah, or sourdough.

Can I prepare it the night before?

Yes, you can prepare the croissant breakfast casserole the night before, cover with foil, and refrigerate it.

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After trying this recipe, I would love to hear your thoughts! Consider leaving a star rating in the recipe card located below or sharing your feedback in the comment section. Your reviews and comments are highly valued and appreciated.

Freshly baked croissants with melted cheese and ham, topped with herb-infused melted butter.

Easy And Delicious Croissant Breakfast Casserole

Jenny DeRemer
If you love hosting brunch, you'll adore this easy and delicious Croissant Breakfast Casserole – a delightful blend of croissants, ham, and cheeses, topped with an herby honey butter drizzle! Perfect for lazy weekends and holiday gatherings.
No ratings yet
Servings: 6 servings
Prep Time 10 minutes
Cook Time 45 minutes
Inactive Time 5 minutes
Total Time 1 hour
Course Breakfast, Brunch
Cuisine American, Southern
Servings 6 servings
Calories 754 kcal

Equipment

Ingredients
 

For the Casserole

  • 1 tablespoon unsalted butter softened
  • 6-8 croissants day old
  • 4 large eggs
  • 1/2 cup heavy cream
  • 1 tablespoon Dijon mustard
  • 1 teaspoon garlic powder
  • 1 teaspoon Kosher salt
  • 1 teaspoon black pepper
  • 2 tablespoons rosemary fresh; 1 tbsp minced, 1 tbsp intact leaves
  • 1 tablespoon thyme fresh; minced
  • 12 slices deli ham
  • 12 1-ounce pieces Swiss cheese
  • 1/4 cup Parmesan cheese grated or shaved from a large block

For the Herby Honey Butter

  • 1/2 cup unsalted butter melted
  • 1/2 cup honey
  • 1 tablespoon thyme and rosemary fresh

Instructions
 

For the Casserole

  • Preheat oven to 350°F. Grease a 9 x 13-inch baking dish using 1 tablespoon of butter. Microwave 6 to 8 croissants for 15 to 20 seconds; set aside.
    1 tablespoon unsalted butter, 6-8 croissants
  • In a large bowl, whisk eggs, heavy cream, and Dijon, salt, garlic powder, and black pepper until smooth. Add chopped herbs and whisk again until light in color and silky.
    4 large eggs, 1/2 cup heavy cream, 1 tablespoon Dijon mustard, 1 teaspoon garlic powder, 1 teaspoon Kosher salt, 1 teaspoon black pepper, 2 tablespoons rosemary, 1 tablespoon thyme
  • Tear the croissants into thirds. Dunk each (now cooled) piece into the egg custard. Arrange in the prepared baking dish. Pour any remaining egg custard over the croissants.
  • Pinch the ham slices into bundles or fold and roll them into rosettes. Tuck them in between the croissants, followed by the Swiss cheese. Add whole rosemary leaves the same way.
    12 slices deli ham, 12 1-ounce pieces Swiss cheese
  • Sprinkle with freshly grated or shaved Parmesan cheese. Bake the casserole for 45-55 minutes until the top is golden brown and the eggs are set.
    1/4 cup Parmesan cheese
  • Warm equal parts unsalted butter and honey in a saucepan atop the stove. Stir together and stir in fresh minced rosemary and thyme. During the last 15 minutes of the bake, baste the honey butter over the top of the casserole like you would a glaze. Do this several times, allowing it to caramelize each time it's basted and placed back into the oven.
    1/2 cup unsalted butter, 1/2 cup honey, 1 tablespoon thyme and rosemary
  • Let it cool for a few minutes before slicing and serving with remaining honey butter drizzled or tableside.

Notes

Make Ahead – Cover the dish with foil and let it sit in the refrigerator by several hours or overnight. When ready to bake, remove the casserole from the fridge and let it sit at room temperature while the oven preheats. Resume the recipe instructions and cook time.
Leftovers and storage – Wrap leftovers tightly with plastic wrap, then refrigerate for up to 3 days. To reheat –place in an oven preheated to 350F for 15-20 minutes or until heated through.
To freeze – Allow to cool completely, then wrap tightly with aluminum foil and freeze for up to 2 months. To thaw – simply place the casserole in the refrigerator overnight. To reheat – bake the casserole at 350F for 30-35 minutes, or until heated through.

The nutrition value can vary depending on what product(s) you use. The information below is an estimate. Always use a calorie counter you are familiar with.

Please note that table salt and iodized salt are NOT substitutions for Kosher salt. Do not deviate unless otherwise specified.

Nutrition

Serving: 1servingCalories: 754kcalCarbohydrates: 52gProtein: 24gFat: 51gSaturated Fat: 28gPolyunsaturated Fat: 3gMonounsaturated Fat: 16gTrans Fat: 1gCholesterol: 270mgSodium: 1.426mgPotassium: 352mgFiber: 2gSugar: 30gVitamin A: 1.611IUVitamin C: 5mgCalcium: 152mgIron: 3mg
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