Well I have made them just by what I think would be nice.

4 Thigh Fillet, chopped into bite size peices
1 Onion, sliced thinly
8 Mushrooms, sliced thinly (I used cup mushrooms)
3 cloves Garlic
3 tbsp Flour
1 1/2 cups of Chicken Stock
4 tbsp Milk
2 tbsp Mustard Powder

Saute Chicken, Onion, Garlic. Add mushrooms. Sprinkle flour over mixture and cook for a couple of minutes. Add Stock, Milk and Mustard Powder. Let simmer till thick. Let cool and make the filos.