Melt the butter in a large frying pan over a medium heat. When bubbling, fro in the kale and cook for about 4 minutes, the kale should breakdown and become nice and tender.
Crank up the heat and add the garlic and chicken. Stir fry for about 4 minutes, by which time the chicken should be cooked.
Pour on a bout 2 tablespoons of water and reduce the heat to medium. Dollop in the mascarpone and, using a wooden spoon, stir gently as it melts.
When the mascarpone has become a creamy sauce, bring it back to the boil and stir in the grated Parmesan.
Remove the pan from the heat and stir through the chopped herbs, before serving up with a good Squeeze of lemon juice