Chop the pre-cooked chicken.
Make a white sauce of the butter, flour and milk.
Add salt, pepper and other seasonings to the white sauce.
Cool. Combine chicken and seasoned sauce.
Shape into eight croquettes. (About the size of large meatballs.)
Dip in beaten eggs, then into crumbs.
Pan-fry in olive oil at medium heat, for 3-5 minutes per side, or until brown. Set on napkins or paper towels to remove excess oil before serving.