Pre heat the oven to 200℃/400F, fan 220℃/425F or Gas Mark 7.
Put the potatoes and olive oil into the pan, toss the potatoes until coated and bake for about 30 minutes, until starting to soften.
Add the chicken fillets and then spoon the pesto on top of the potatoes and chicken. Put back into the oven for 10 minutes.
Add the green beans, tomatoes and salt and pepper, and toss in the pesto-y juices. Put back into the oven for 10 more minutes or until the chicken is cooked through.
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