1. Combine light brown sugar and next 5 ingredients. Rub mixture over turkey breast; cover and chill 8 hours.
2. Preheat oven to 350°. Let turkey breast stand at room temperature 30 minutes. Place turkey breast on a rack in a roasting pan, breast side up. Pour chicken broth in bottom of pan. Cover turkey loosely with aluminum foil.
3. Bake at 350° for 1 hour and 45 minutes or until a meat thermometer inserted into thickest portion registers 170°. Transfer turkey to a serving platter, and let stand 15 minutes before slicing.