Preheat the oven to 180C/gas mark 4. Cut tomatoes into wedges.
Place chicken fillets on a lined baking tray and then sprinkle with rosemary leaves.
Wrap three slices of pancetta around each fillet and place tomato wedges on the tray. Spray chicken and tomatoes with the cooking oil spray and drizzle everything with the balsamic vinegar.
Place in the oven for 15-20 minutes or until the chicken is cooked through and the pancetta is crispy.
While the chicken is cooking, peel and chop the potatoes and steam in the microwave on high for 6-8 minutes (adjust cooking time depending on microwave power) until tender. Or steam in a steaming basket on the stovetop for 8 - 10 minutes until tender. When tender, drain the potatoes, reserving 1/3 cup of cooking water. Then mash with reserved water, Parmesan and natural yoghurt. Season with salt and pepper.
Steam the beans for a couple of minutes in the microwave.
Arrange mash on serving plates, top with chicken and serve with
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