01 - Preheat oven to 350°F. This ensures the oven reaches the correct temperature for even baking.
02 - Place chicken breasts between two sheets of plastic wrap and pound to about 1/2-inch thickness using a meat mallet. Uniform thickness ensures even cooking and easier rolling.
03 - Season both sides of each chicken breast evenly with salt, black pepper, garlic powder, and paprika.
04 - Lay 1 slice of deli ham and 1 slice of Swiss cheese on top of each seasoned chicken breast.
05 - Roll each chicken breast tightly, tucking in the ends to enclose the filling. Secure the seam with toothpicks to hold shape during cooking.
06 - Set up three shallow bowls: place the all-purpose flour in the first, beat the eggs with milk in the second, and combine the panko breadcrumbs with grated Parmesan in the third.
07 - Coat each chicken roll in flour, shaking off excess. Dip into the egg mixture, then press firmly into the panko-Parmesan mixture until evenly coated on all sides.
08 - Heat vegetable oil in a large oven-safe skillet over medium-high heat. Sear each breaded chicken roll until golden brown on all sides, approximately 2 to 3 minutes per side.
09 - Transfer the skillet directly to the oven, or place the chicken rolls on a baking sheet. Bake for 20 minutes until the internal temperature reaches 165°F and the cheese is fully melted.
10 - Remove from the oven and carefully extract all toothpicks. Allow the chicken to rest for 2 to 3 minutes, then slice into pinwheels and serve hot.