White sauce help needed....

We went to Denny's for dinner a few weeks ago, my country fried steak had a sauce that was super. So, tonight we were at Denny's and I again ordered the country fried steak. I asked "What is the sauce on this steak?" The cook said "it is a simple white sauce." The taste was so completely different I could not believe it. So, my question is ..... What herbs &/or spices do you use in a white sauce? There was no cheese in the sauce and it may have had a slight tinge of green or just wee bits of a green herb? I would really like to recreate this sauce. I've looked all over the cooking sites and none come even close. Some even adding nutmeg...... Yuck!