MELT butter in medium saucepan over medium heat. Stir in flour. Gradually stir in evaporated milk. Cook, stirring constantly, until mixture comes to a boil. Add vegetables, chicken, broth and onion salt. Heat through.
NOTE: For a lower-fat version of this recipe, substitute NESTLÉ CARNATION Evaporated Lowfat 2% Milk and 1 can (14.5 fl. oz.) light or fat-free chicken broth. Proceed as above.