How to Make It
Combine first 7 ingredients in a bowl, stirring with a whisk. Place 1/2 cup ketchup mixture in a small bowl. Add chicken to remaining ketchup mixture; toss. Let stand 5 minutes.
Heat a grill pan over medium-high. Coat pan with cooking spray. Remove chicken from ketchup mixture; discard ketchup mixture. Add chicken to pan; grill 5 minutes on each side or until done, brushing occasionally with reserved 1/2 cup ketchup mixture. Remove chicken from pan; sprinkle with salt.
Heat potatoes according to package directions. Serve with chicken.