Dice the chicken up .Fry it off .Chuck it a bowl and add whatever you want ,mushrooms ,peas ,onion ,sliced peppers etc .Use your imagination .Make a white sauce .A roux of butter and flour then gradually add milk to thicken ,season,and then add that splash of white wine. The sauce should be not too thick and not too thin .Pour it over the chicken ,stir it all up ,bung it in a pie dish . Wet the edges of the pie dish .Roll out the pastry and put it on top,knock the edges up and make a slit in the top and and brush it with beaten egg . Bake in a hot oven until the pastry is golden brown .Tuck in :)