A new coffee, sandwiches and salad place called Hidden Treasure opened in Highland at the corner of Rte 216 and Rte 108, according to a tip from Laura and an anonymous comment on another post.
Hidden Treasure also serves up ice cream and bakery items -- Laura vouches for the cupcakes. This is apaprently next to the Subway in the newish commerical development right at the Rte 216 and Rte 108 intersection. Easy to reach from Clarksville or from Fulton/Maple Lawn.
If you go past Hidden Treasure, you should check out Highland's landmark Boarman's -- a country grocery store at the same intersection with great sausages and crab cakes that you can make at home.