HEAT dressing in large nonstick skillet on medium-high heat. Add peppers; cook and stir 2 min. Add meat and chili powder; cook 10 min. or until meat is done, stirring frequently.

STIR in tomatoes, beans and salsa. Bring to boil; cover. Simmer on medium heat 15 min., stirring occasionally.

SERVE topped with cheese and sour cream.