2largeskinless, boneless chicken breasts 1½ lb. total
1pinchKosher salt
1pinchfreshly ground pepper
4thin slicesham or prosciutto4 oz. total
4thin slicesGruyère or Swiss cheese4 oz. total
¾cupbreadcrumbs, dried
¼cupparsley, finely chopped
1largeegg
½cupall-purpose flour
3tbsp.Vegetable oil
4tbsp.Dijon mustard
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Instructions
Trim any fat around edges of chicken. Slice each chicken breast horizontally in two. Place each chicken breast in a ziplock bag, smooth side down and pound with a mallet or rolling pin until about ¼" thick. Season chicken all over with salt and pepper.
Arrange chicken smooth side down on a clean work surface. Spread Dijon mustard on each breast. Layer each with one slice of ham and one slice of cheese, leaving space around the edges. Fold each end of the breast over the ham and cheese to the middle. Once turned over you achieve a nice clean finish.
Combine breadcrumbs, parsley, 1 tsp. salt, and ½ tsp. pepper in a shallow bowl. Whisk egg and 1 Tbsp. water in another shallow bowl. Spread flour on a plate.
Press both sides of chicken in flour, shaking off any excess, then dip both sides into egg mixture. Coat all over with breadcrumb mixture, patting with your fingers to adhere. Transfer to a plate.
Refrigerate for an hour to help seal the coating.
Heat oil in a large heavy skillet over medium-high until shimmering. Cook chicken, turning occasionally, until browned on all sides, 2–3 minutes per side. Transfer to a wire rack set in a rimmed baking sheet; season with salt.
Preheat oven to 375. Bake chicken until an instant-read thermometer inserted into the thickest part registers 165°, about 10-15 minutes.