Preheat your oven to 350°F.
In a large bowl, cream together the softened butter, peanut butter, granulated sugar, and brown sugar until smooth.
Beat in the eggs one at a time, then stir in the vanilla extract.
In a separate bowl, whisk together the flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Fold in the peanut butter chips.
Drop rounded tablespoons of dough onto ungreased baking sheets, spacing them about 2 inches apart.
Bake for 10-12 minutes, or until the edges are lightly golden.
Allow the cookies to cool on the baking sheets for 5 minutes before transferring them to wire racks to cool completely.