Preheat oven to 375 degrees.

In a large bowl, with an electric mixer, beat shortening and peanut butter until well blended, add sugars and beat until light and fluffy. Add egg, milk and vanilla, beat well.

In another bowl, stir together flour, baking soda and salt, gradually beat into peanut butter mixture. Shape dough into 1-inch balls and roll in additional sugar.

Place on un-greased cookie sheet and bake 8-10 minutes or until lightly browned. Immediately place a Hershey's kiss on each cookie and press down slightly.