Mushroom and Leek Alfredo Pasta

1 Tbsp olive oil 

1 large leeks, thinly sliced

200g sliced mushroooms

2 garlic cloves, finely chopped

1/4 cup  chicken broth 

3/4 cup sour cream

1 Tbsp chopped Dill or Parsley

Salt and Pepper

Parmesan to serve 

150g cooked pasta

Saute leek for 2 minutes, add mushrooms and garlic and cook uncovered until mushrooms are soft. Stir in chicken broth and sour cream. Add dill and seasoning, cook another minute uncovered to allow to thicken slightly.  Pour over pasta and top with grated parmesan.