Preheat the oven to 350.
In a large mixing bowl, cream shortening, sugar, peanut butter, eggs, and vanilla.
Add dry ingredients.
Spread onto large cookie sheet.Bake at 350.
Cool partly before glazing.For glaze: combine water and butter.Bring to a boil.Blend well, then add sugar and vanilla.Beat until smooth, then spread over the dessert.Let cool and cut into bars.