"If you love chicken cordon bleu because of its winning flavor combination of chicken, ham, and Gruyere cheese, you'll love this sandwich. It has all the satisfying flavors of chicken cordon bleu with half the work!"
1Preheat oven to 425 degrees F (220 degrees C). Line a baking sheet with heavy-duty aluminum foil.
2Combine bread crumbs and 1 teaspoon melted butter in a small bowl.
3Melt 2 tablespoons butter in a saucepan over medium heat. Cook and stir ham and onion in melted butter until onion turns translucent, about 5 minutes. Stir in thyme and cook for 1 minute. Add flour and cook, stirring constantly, until flour has lost its raw smell, about 3 minutes. Remove from heat and pour in 1/2 cup plus 1 tablespoon milk. Place saucepan back over medium heat and cook, stirring constantly, until sauce is thick, 1 to 2 minutes.
4Remove saucepan from heat and add 1/2 cup shredded Gruyere cheese, Dijon mustard, salt, black pepper, cayenne pepper, and nutmeg. Stir to combine.
5Stir chicken and diced pickle into cheese sauce.
6Place toasted bread slices on the prepared baking sheet. Brush one side of each bread slice with 3/4 teaspoon melted butter. Turn slices over and top each with 1/4 of the cheese sauce. Sprinkle 1 tablespoon shredded Gruyere cheese over the top of each sandwich. Top with bread crumb mixture.
7Bake sandwiches in the preheated oven until cheese is bubbling and chicken mixture is hot, 15 to 20 minutes.
Footnotes
Tip
Aluminum foil helps keep food moist, ensures it cooks evenly, keeps leftovers fresh, and makes clean-up easy.