These Mini Croque Monsieur Bites are an ideal addition to holiday gatherings or weekend brunches. Flaky puff pastry cups are filled with smoky ham, a blend of Gruyère and Swiss cheeses, and a silky béchamel flavored with Dijon and thyme. Baked until golden and bubbling, they’re easy to assemble and perfect served warm.
A traditional croque monsieur is a French bistro sandwich layered with thinly sliced ham, Gruyère and Swiss cheeses, and Dijon mustard, finished with béchamel and baked until bubbly. This recipe keeps those classic flavors but turns them into bite-sized puff pastry cups that work beautifully as appetizers, breakfast items, or party hors d’oeuvres.
Ingredients
- For the béchamel: 1 tablespoon unsalted butter; 1 tablespoon all-purpose flour (or cassava/gluten-free all-purpose flour for a gluten-free version); 2/3 cup whole milk (plus more as needed); 1/4 teaspoon kosher salt; 1/2 teaspoon fresh thyme (plus more for garnish); 1 teaspoon Dijon mustard.
- For the cheese mix: 1/2 cup finely grated Gruyère; 1/2 cup finely grated Swiss; 1/2 teaspoon garlic powder; 1/2 teaspoon dried thyme; 1/4 teaspoon freshly ground black pepper.
- For assembly: One 14-oz puff pastry sheet, thawed in the refrigerator for about 4 hours or overnight; 3 tablespoons Dijon mustard; 6 slices smoked deli ham, diced small (about 1/2 pound); 3 teaspoons fresh thyme for garnish. Cooking oil spray for the muffin tin.
Step-by-step
Step One: Thaw the Puff Pastry
Make sure the puff pastry is fully thawed before you begin. Thaw overnight in the refrigerator or at room temperature for about 4 hours. Cold pastry can crack when you try to unfold or shape it.
Step Two: Make the Béchamel
In a small saucepan over medium heat, melt 1 tablespoon unsalted butter. Add 1 tablespoon flour and whisk for 1 to 2 minutes until the mixture is smooth, slightly foamy, and smells lightly toasted. While whisking constantly, gradually pour in 2/3 cup whole milk and bring the mixture to a gentle simmer. Continue whisking until the sauce is smooth and has thickened to about the consistency of Alfredo sauce. Remove from heat and stir in 1/4 teaspoon kosher salt, 1/2 teaspoon fresh thyme, and 1 teaspoon Dijon mustard. Allow the béchamel to cool — if it becomes too thick as it cools, whisk in 2 to 3 tablespoons of milk to loosen it.
Step Three: Make the Cheese Mixture
Combine the grated Gruyère and Swiss in a small bowl. Stir in 1/2 teaspoon garlic powder, 1/2 teaspoon dried thyme, and 1/4 teaspoon freshly ground black pepper. Set aside.
Step Four: Prepare the Puff Pastry
Preheat the oven to 400°F (200°C). Lightly spray a muffin tin with cooking oil. On a floured surface, gently unfold and roll the thawed puff pastry just enough to smooth the fold lines. Trim the edges if needed and cut the sheet into twelve 3″ x 3″ squares. Press each square into a muffin cup to form a small crust. Brush about 1 teaspoon Dijon mustard into the bottom and up the sides of each pastry cup to build that classic Croque flavor.
Step Five: Fill the Cups
Divide the diced ham evenly among the pastry cups (about 2 tablespoons per cup). Add about 2 teaspoons béchamel to each cup, then top with a heaping tablespoon of the cheese mixture. Place an extra small piece of ham on top of each portion and sprinkle with fresh thyme.
Step Six: Bake, Cool, and Serve
Bake at 400°F for 20 to 22 minutes, until the pastry is golden all around and the cheese is bubbling. Remove from the oven and allow the bites to cool in the tin for about 10 minutes so the béchamel and cheese set slightly. Carefully remove each bite from the muffin tin and serve warm.
Recipe FAQ
If the béchamel becomes too thick while cooking or after it cools, whisk in milk 2 tablespoons at a time until you reach the desired consistency. The sauce should be pourable but not runny when assembling the cups.
Yes. Use gluten-free puff pastry and replace the flour in the béchamel with cassava or a gluten-free all-purpose flour. Gluten-free puff pastry may not become as flaky but will still produce tasty bites.
Assemble the bites and cool them completely, then store in an airtight container in the refrigerator for 1 to 2 days. Reheat in a 350°F oven for 10 to 15 minutes until warmed through and the pastry is crisp again.
These Mini Croque Monsieur Bites are a crowd-pleasing, evergreen recipe that captures classic French flavors in an easy, shareable format. Prepare them for holiday parties, brunch, or anytime you want a savory, cheesy bite with flaky pastry. Enjoy!
Mini Croque Monsieurs
- Prep time: 30 minutes
- Cook time: 20 minutes
- Total time: 48 minutes
- Servings: 6 (makes 12 mini bites)
- Author: Alex Snodgrass
Notes
Sauce note: If your béchamel seems too thick, thin it with milk 2 tablespoons at a time until it reaches the right consistency. It may thicken as it cools; whisk in a little milk before assembling if needed.
Gluten-free note: Swap in gluten-free puff pastry and use cassava or gluten-free all-purpose flour in the béchamel. Expect slightly different texture from traditional puff pastry, but the flavor will still be delicious.