Salsa With a Zing with broth

6 boneless skinless chicken breast halves 1 1/2 tablespoons butter 1 1/2 tablespoons vegetable oil 1 medium onion , chopped 1 clove garlic , minced 2 stalks[...]

4 tablespoons butter 1/2 cup all-purpose flour 14 1/2 ounces chicken broth 15 ounces salsa verde (about 2 cups) 5 ounces evaporated milk 1 large rotisserie[...]