Preheat oven to 350°F (175°C).

Grease a cookie sheet.

In a large bowl, cream together shortening, brown sugar, and peanut butter using an electric mixer at medium speed for about 5 minutes.

Add eggs and vanilla; continue beating until well combined.

In a separate bowl, whisk together flour, salt, and soda.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Drop rounded tablespoons of dough onto the prepared cookie sheet.

Bake for 12 to 15 minutes, or until golden brown.

Let cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.