Preheat oven to 375 degrees.
In mixer - combine peanut butter, shortening, brown sugar, milk & vanilla. Beat well.
Add eggs - beating until just combined
Add flour, baking soda & salt - beat on low to combine & then beat well for approx 1 minute to bring to a fluffier consistency
Take tablespoon size portion & roll between hands to form a ball - then flatten slightly & place on ungreased cookie sheet
Bake 8-9 minutes or until edges are beginning to brown
Remove & cool on tray approx 5 minutes before transferring to wire rack to cool completely.
Once cool - spread Nutella on cookie & pair with another like sized cookie to form "sandwich"