Cream together sugar and butter; stir in eggs and milk.
Sift together flour, baking powder, soda, cinnamon and salt; stir into creamed mixture. Add prunes, nuts and vanilla.
Drop by teaspoonfuls about 2" apart onto greased baking sheet. Bake in moderate oven (350°) 15 to 20 minutes, until lightly browned. Remove cookies and cool on racks.