Preheat the oven to 180 degrees Celcius.
Slice the chicken in half and cover the pieces (all over) with the Pesto in an oven dish, add a bit of salt. I do this 2 hours before cooking but you can do this in the morning, or just before cooking as well. The flavour is still the same.
Place the chicken in the oven and cook for 20 to 25 min. Check that the chicken is just about cooked.
Remove the chicken from the oven and set the oven to grill (usually at 200 degrees Celcius).
Place the tomato slices over the chicken pieces. Add a bit of salt on them. Then cover everything with the grated cheese.
*The amount of cheese is completely up to you :)
Bake for another 10 min.