HEAT oven to 375ºF.
MIX dressing, sugar and thyme in large bowl. Add potatoes; toss to coat. Transfer potatoes to 15x10x1-inch pan, reserving dressing mixture in bowl.
ADD chicken to reserved dressing mixture; toss to coat. Place in pan with potatoes.
BAKE 1 hour or until potatoes are tender and chicken is done (165ºF). Transfer chicken and potatoes to platter. Strain drippings from pan; pour strained sauce over chicken.