Cut each chicken breasts lengthwise into two, separate long and flat pieces.
Preheat your oven to 350° Fahrenheit/ 180° Celsius.
Spread all 8 pieces on a board and sprinkle on both sides with Salt and Pepper.
Half your 4 Ham slices into 2 so that you have 8 pieces. Add one ham half on each chicken piece. Fold your cheese slice into a square small parcel and add it on top of the ham.
Now take one side of the stacked meat and cheese ingredients and slowly roll in as shown in the picture.
Fix the Chicken Roll with a tooth pick, and do the same with the remaining chicken, ham and cheese stacks. Add a dash of olive oil on the rolls and sprinkle with oregano
Bake for about 20-25 minutes or until the chicken is cooked, at around 350° Fahrenheit/ 180° Celsius.