SPRINKLE chicken with chili powder; cook in large nonstick skillet on medium heat 6 to 8 min. on each side or until done (165ºF). Transfer to plate; cover to keep warm.
ADD vegetables and salsa to same skillet; cook and stir 4 min. or until heated through.
SPOON rice onto platter; top with chicken, vegetable mixture, cheese and sour cream.