Add leek and mushrooms and chopped in the saucepan with a bit of oil to tender (full power heat)

While, prepare the chicken stock.

Once the vegs are tender, add the rice to the saucepan, mix everything well and add the stock (you can use veg/chicken or meat stock, the one you like more)
Add salt and pepper (not much :p)

Add more water and turn the heating down. Leave it cooking till you think the rice is cooked, add more stock as the water consumes.

Add the cheese (as much as you want) mix it well and turn the heat off