Use a knife to cut the chicken breast down the middle without cutting through it, forming a pocket in the breast. Fold the cheese in half and place 2 slices of cheese in each pocket. Repeat with the ham. Close the pockets and seal with 2 toothpicks. Sprinkle with salt and pepper.
Mix mayonnaise, mustard, salt, and pepper in a bowl. Spread the mixture on the top and sides of the chicken (do not spread it on the bottom). Sprinkle the breadcrumbs over the chicken and use the other hand to press the breadcrumbs onto the sides of the chicken. Spray with oil.
3 tbsp Mayonnaise, 1 1/2 tbsp Dijon Mustard, Kosher Salt, Crushed Black Pepper
Melt the butter in a small saucepan over medium heat. Add the flour and cook for 1 minute. Add half of the milk and stir until the flour mixture is well combined. Add the remaining milk, mustard, and cheese. Cook for 3 minutes, stirring constantly, until it thickens. It will thicken further as it cools. Remove from the heat and season with salt and pepper.
1 1/2 tbsp Unsalted Butter, 1 1/2 tbsp All Purpose Flour, 1 1/4 cup Whole Milk, 1 1/2 tbsp Dijon Mustard, 2 tbsp Parmesan Cheese, grated
Carefully place the chicken breast in the basket and return the basket back to the Dome 2.
Cook the cordon bleu.Temperature: 355 °F Time: 20 minutes
Remove the Cordon Bleu from the Dome and transfer to a serving tray or plate
Slice the Cordon Bleu and serve with the sauce and your favorite side dishes.