Cream shortening and peanut butter. Add sugar and brown sugar. Add egg, milk, and vanilla; beat well. Combine flour, baking soda and salt; gradually add creamed mixture and blend thoroughly. Shape dough into 1-inch balls; roll in sugar. Place on ungreased cookie sheet. Bake 10-12 minutes in 375 degree oven. Remove from oven immediately and place an un-wrapped kiss on top of each cookie. Remove from cookie sheet; cool.