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Spread a layer of Dijon mustard over the flattened chicken, followed by placing the slices of Parma or Serrano ham atop. Add a handful of baby spinach and sprinkle the grated gruyere or mozzarella for an added layer of flavor.
Frying and Baking the Chicken
In a pan, heat a combination of olive oil and butter over medium heat. Once the butter has melted and is bubbling, carefully place the prepared chicken breasts in the pan. Fry until they are golden brown on each side, which should take about 3 minutes per side.
After browning, transfer the chicken to the oven and bake at 180°C (356°F) for an additional 10 minutes. This will ensure that the chicken is cooked through and remains juicy.