Ingredients:
25g/1oz butter
1 tbsp plain flour
110ml/4fl oz milk
110g/4 oz cooked chicken
2 tbsp (cooked) frozen vegetables
1 small mashed potato

Method:
1. Melt the butter in a saucepan, stir in the flour and cook for two minutes.
2. Gradually add the milk, stirring continuously. Bring to a gentle boil and simmer for 5 mins.
3. Cut the chicken into small pieces and mash with the cooked veg and potato. Stir into the white sauce.
(You can also use cooked white fish instead of chicken in this recipe, just be very careful to remove even the very small bones)