Why This Recipe Will Transform Your Weeknights
Golden, gooey, and gently savory, this Croque Monsieur Breakfast Casserole takes everything you love about the classic French sandwich and turns it into a make-ahead, family-friendly casserole. Buttery croissants soak up a Dijon-thyme custard, layered with black forest ham and bubbly cheese. It’s the kind of meal that impresses without the stress. Whether you’re feeding your family or hosting brunch, this bake delivers comfort and class in every bite.
Table of Contents
My Culinary Journey: From Childhood Kitchen to Your Table
Hi, I’m Sophie Martin founder of FlavorKitch, wife, and mom of two. My passion for cooking simple, comforting homemade meals started as a child in my grandmother’s kitchen. After spending 10 years in professional kitchens, I returned home with a mission: to create real-food casseroles that nourish busy families like mine. This croque monsieur breakfast casserole recipe captures everything I love crisped edges, creamy centers, and nostalgic flavors crafted with ease and French flair.
PrintCroque Monsieur Breakfast Casserole Recipe Easy, French-Inspired Brunch Bake
A savory, cheesy Croque Monsieur Breakfast Casserole made with croissants, ham, Dijon custard, and golden cheeses. A perfect French-inspired brunch bake.
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Total Time: 60 minutes
- Yield: 8 servings 1x
- Category: Breakfast, Brunch
- Method: Baking
- Cuisine: French
Ingredients
5 cups torn day-old croissants
½ lb. thinly sliced black forest ham, chopped
1½ cups shredded Gruyère cheese, divided
4 tbsp unsalted butter, melted
8 large eggs
1½ cups whole milk
½ cup whole milk Greek yogurt
1 tsp kosher salt
1 tsp ground black pepper
1 tsp garlic powder
1 tbsp Dijon mustard
1 tbsp chopped fresh thyme, plus more for garnish
½ cup grated Parmesan cheese
Instructions
1. Grease a 9×13 baking dish and preheat oven to 375°F.
2. Scatter croissants in dish. Add ham and 1 cup Gruyère on top.
3. Whisk eggs, milk, yogurt, butter, mustard, thyme, garlic powder, salt, and pepper.
4. Pour custard over croissants. Press gently to soak.
5. Top with remaining Gruyère and Parmesan.
6. Bake 30 minutes on middle rack. Move to top rack and bake 15–20 more minutes until golden and set.
7. Cool for 10 minutes. Slice, garnish with thyme, and serve.
Notes
Best served warm. Can be prepped overnight and baked fresh in the morning.
Nutrition
- Serving Size: 1 slice
- Calories: 440 kcal
- Sugar: 4 g
- Sodium: 690 mg
- Fat: 31 g
- Saturated Fat: 15 g
- Unsaturated Fat: 16 g
- Trans Fat: 0 g
- Carbohydrates: 22 g
- Fiber: 1 g
- Protein: 21 g
- Cholesterol: 190 mg
Ingredients for Croque Monsieur Breakfast Casserole with Croissants
Base Layer
- 5 cups day-old croissants, torn into pieces (about 3–4 large croissants)
These soak up the custard and crisp beautifully. Substitute: brioche or challah.
Protein Layer
- ½ lb. black forest ham, thinly sliced and roughly chopped
Use quality deli ham or leftover holiday ham. Turkey ham works perfectly for pork-free diets.
Cheeses
- 1½ cups shredded Gruyère cheese, divided
Melts beautifully with a nutty flavor. Sub: Swiss or Emmental. - ½ cup grated Parmesan cheese
Adds saltiness and depth.
Custard Mixture
- 8 large eggs
- 1½ cups whole milk
- ½ cup whole milk Greek yogurt
Creates creaminess without heavy cream. - 4 tbsp unsalted butter, melted and cooled
- 1 tbsp Dijon mustard
Essential for that Croque Monsieur tang. - 1 tbsp fresh thyme leaves, chopped
- 1 tsp garlic powder
- 1 tsp kosher salt
- 1 tsp freshly ground black pepper
Preparation: How to Make This Croque Monsieur Breakfast Bake
1. Prep Your Dish
Grease a 9×13-inch baking dish with butter. Preheat oven to 375°F and position one rack in the middle, one near the top.
2. Build the Base
Scatter torn croissant pieces evenly in the dish. Layer chopped ham on top, followed by 1 cup of shredded Gruyère.
3. Whisk the Custard
In a large mixing bowl, whisk together eggs, milk, Greek yogurt, melted butter, Dijon, thyme, garlic powder, salt, and pepper until smooth.
4. Pour & Soak
Slowly pour the custard over the croissant mixture, pressing gently to ensure all pieces soak it in.
5. Add Cheese Topping
Sprinkle the remaining ½ cup of Gruyère and all the Parmesan evenly over the top.
6. Bake to Golden Perfection
Bake on the center rack for 30 minutes. Then move to the top rack and bake an additional 15–20 minutes until deeply golden and puffed.
7. Cool, Slice, Serve
Let the casserole rest for 10 minutes before slicing. Garnish with a pinch of fresh thyme.
Serving Suggestions
Pair with a crisp arugula salad tossed in lemon vinaigrette. For brunch drinks, serve with fresh-pressed orange juice or a cold brew coffee. For presentation, garnish with thyme sprigs and a light dusting of Parmesan.
Internal link: Try this with our Baked French Toast Casserole for a sweet-savory brunch combo!
Expert Tips for the Best Croque Monsieur Breakfast Casserole
Use Day-Old Croissants
They hold shape better and soak up the custard without turning mushy.
Make It Overnight
Assemble the casserole, cover, and refrigerate overnight. Just bake fresh in the morning.
Channeling Croque Monsieur Casserole Bobby Flay
For a gourmet twist, whisk a splash of béchamel into the custard Bobby Flay style! Use smoked gouda or a dash of nutmeg for complexity.
Swap In Croissants, Not Bread
Croissants create those signature flaky pockets and buttery richness a step above basic bread.
How to Store, Reheat & Freeze
Storage
Cool completely. Store slices in airtight containers for up to 4 days in the fridge.
Reheating
Warm in a 325°F oven for 10–12 minutes, or microwave individual servings for 90 seconds.
Freezing
Wrap fully baked and cooled casserole tightly in foil. Freeze up to 2 months. Thaw overnight in fridge, then reheat at 350°F for 25–30 minutes.
FAQs: Croque Monsieur Breakfast Casserole Answers You Need
How is a Croque Monsieur made?
Traditionally, a croque monsieur is a grilled French ham-and-cheese sandwich topped with béchamel and baked or broiled until golden. This casserole version translates all those elements into a make-ahead brunch dish.
What are the ingredients for a breakfast casserole?
Eggs, milk, bread (or croissants), cheese, and protein (like ham or sausage). This version includes Dijon and thyme for a French twist.
What is the difference between Croque Monsieur and Croque Madame?
A Croque Madame is a Croque Monsieur topped with a fried or poached egg. Add a sunny-side egg to this casserole for that upgrade!
How to assemble a Croque Monsieur?
Layer ham and cheese between slices of bread (or croissants), top with béchamel, and bake. This casserole simplifies that into layers baked in a dish.
More Delicious Brunch Recipes
- French Toast Casserole with Brioche
- Salmon Casserole: Easy, Delicious Comfort
- Steak and Potatoes Casserole: Easy Family Favorite with Garlic Butter
Easy Croque Monsieur Breakfast Casserole with Croissants, French-Inspired Brunch Bake
Ingredients
Base Layer
- 5 cups day-old croissants, torn into pieces (about 3–4 large croissants)
These soak up the custard and crisp beautifully. Substitute: brioche or challah.
Protein Layer
- ½ lb. black forest ham, thinly sliced and roughly chopped
Use quality deli ham or leftover holiday ham. Turkey ham works perfectly for pork-free diets.
Cheeses
- 1½ cups shredded Gruyère cheese, divided
Melts beautifully with a nutty flavor. Sub: Swiss or Emmental. - ½ cup grated Parmesan cheese
Adds saltiness and depth.
Custard Mixture
- 8 large eggs
- 1½ cups whole milk
- ½ cup whole milk Greek yogurt
Creates creaminess without heavy cream. - 4 tbsp unsalted butter, melted and cooled
- 1 tbsp Dijon mustard
Essential for that Croque Monsieur tang. - 1 tbsp fresh thyme leaves, chopped
- 1 tsp garlic powder
- 1 tsp kosher salt
- 1 tsp freshly ground black pepper
Instructions
1. Prep Your Dish
Grease a 9×13-inch baking dish with butter. Preheat oven to 375°F and position one rack in the middle, one near the top.
2. Build the Base
Scatter torn croissant pieces evenly in the dish. Layer chopped ham on top, followed by 1 cup of shredded Gruyère.
3. Whisk the Custard
In a large mixing bowl, whisk together eggs, milk, Greek yogurt, melted butter, Dijon, thyme, garlic powder, salt, and pepper until smooth.
4. Pour & Soak
Slowly pour the custard over the croissant mixture, pressing gently to ensure all pieces soak it in.
5. Add Cheese Topping
Sprinkle the remaining ½ cup of Gruyère and all the Parmesan evenly over the top.
6. Bake to Golden Perfection
Bake on the center rack for 30 minutes. Then move to the top rack and bake an additional 15–20 minutes until deeply golden and puffed.
7. Cool, Slice, Serve
Let the casserole rest for 10 minutes before slicing. Garnish with a pinch of fresh thyme.
Serving Suggestions
Pair with a crisp arugula salad tossed in lemon vinaigrette. For brunch drinks, serve with fresh-pressed orange juice or a cold brew coffee. For presentation, garnish with thyme sprigs and a light dusting of Parmesan.
Internal link: Try this with our Baked French Toast Casserole for a sweet-savory brunch combo!
Recipe from flavorkitch
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