01 -
Preheat oven to 190°C.
02 -
Pound each chicken breast to approximately 6 mm thickness with a meat mallet.
03 -
Layer each flattened chicken breast with one slice of ham and one slice of Swiss cheese. Roll up tightly and secure with toothpicks.
04 -
Mix flour with salt and black pepper. Dredge each chicken roll in the seasoned flour, dip in beaten egg, and coat evenly with breadcrumbs.
05 -
Heat olive oil and butter in a skillet over medium heat. Sear each chicken roll for 2 to 3 minutes per side until golden brown.
06 -
Transfer seared rolls to a baking dish. Bake uncovered at 190°C for 20 to 25 minutes until internal temperature reaches 74°C.
07 -
Melt butter in a saucepan over medium heat. Sprinkle in flour and whisk for 1 minute to form a roux. Gradually pour in milk, whisking constantly. Add Dijon mustard and grated Parmesan. Simmer, stirring, until sauce thickens. Season with salt and black pepper.
08 -
Remove toothpicks from chicken rolls, slice into rounds, and arrange on plates. Spoon Dijon-Parmesan sauce over the top and garnish with chopped parsley if desired.