tea/pastry/sit-down bakery in or near somerset county?
The Dessert Plate in Somerville on Main Street directly across from the courthouse serves cake, cookies, pastries, tea and coffee. Most of their business is take out, but they do have two tables, and will serve your food on a "real" plate if you tell them you're staying. They have a limited selection but everything is delicious! I go 1-3 times a week for coffee and a muffin or cookies, and we always order their cakes for holiday meals or houseguests.
Call first, they are closing for a week's vacation... not sure when.