Season the chicken on both sides with salt and pepper. Coat the chicken well with breadcrumbs, using your hands to pack the breadcrumbs on.
Preheat the oven broiler on low.
Heat the oil a large non-stick pan over medium heat. Fry the chicken on both sides golden brown to an internal temperature of 160 degrees using a thermometer. Set aside on paper towels to drain any excess grease.
Spread mustard on both halves of bread. Layer with spring mix and tomato.
Place the chicken on a baking sheet and top with ham and cheese. Place under the broiler until the cheese is melted.
Place the chicken on the bread. Cut in half, serve with chips and pickle. Serve with sparkling water.
Notes
Pro tips: Butterfly the chicken: Lay the breasts down on a cutting board, using a sharp knife parallel to the cutting board slice the breasts through the middle (carefully) all the way in half.