Heat a large fryingpan, add the olive oil. Slice the chicken and stir fry for about 3 to 5 mins

Slice the mushrooms and leeks, chop the garlic, add to the chicken and cook for 3 mins stirring all the time.

Add the stock, bring to the boil and simmer until reduced by half. Add the salt and pepper to your liking

Add the cooked pasta, tarragon and the greek yogurt or cream to the chicken mix and keep stirring for 30 seconds. Remove the pan from the heat and serve with the cooked pasta