Cook beef and onions in large skillet till meat is no longer pink.
Add water, bouillon cubes, gravy and thyme. Bring to a boil, stirring = often. Stir in noodles and frozen vegetables. Bring to a boil, reduce = heat, cover and simmer 8 -10 mins, stirring twice, until noodles are = tender. Remove from heat and stir in sour cream.