Bilad al-Sham Kitchen - Chicken in white sauce

How to prepare chicken with white sauce,

Ingredients:

Half a kilo of chopped chicken breast

Quarter a cup of butter

Quarter a cup of flour

1 liter of milk

Half a cup of mozzarella cheese

1 tablespoon of mustard

1 cup of Mushroom

1 cup of corn

1 chopped red pepper

1 chopped green pepper

1 Chopped onion

Salt and Pepper