Leek, walnut, orzo casserole

My very first blogpost!
I will share a recipe I just invented. It is very quick and easy to prepare.
Ingredients for 3-4 people:
500 gram leeks, cleaned and cut in 5 cm long parts
2 tablespoons butter
250 gram orzo
600 ml vegetable stock
100 gram walnurs
400 gram cremini mushrooms, cleaned and stems removed
125 gram goats cheese or cream cheese

Preheat the oven at 180 degrees. Melt the butter in a frying pan or a stove safe baking pan. Fry the leeks for 5 minutes in the butter and add the orzo. Fry for 2 more minutes. Add the stock and stir well. Transfer to baking pan if using a frying pan. Place baking pan in oven for 10 minutes. Fill the mushrooms with the cheese. Stir the walnuts into the orzo and place the mushrooms on top. Leave in the oven for 10 more minutes until the cheese is melted and the orzo is done.
Serve immediately.