Preheat oven to 375 degrees F.
In a large bowl, cream together butter, peanut butter, 1 cup sugar, and brown sugar.
Add vanilla and mix.
Add the eggs in one at a time, mixing well after each one.
In a separate bowl mix the flour, baking soda and salt together. Add to mixture in mixing bowl and stir until completely combined.
Fold in peanut butter chips.
Roll dough into 1 1/2" balls.
Place 1/4 cup sugar into a small bowl and roll each ball of dough in the sugar until completely covered.
Place rolled dough on a baking sheet lined with parchment paper or sprayed with nonstick cooking spray and gently press each dough ball down to 1/2 inch thick.
Bake the cookies for 7-9 minutes.
Remove cookies and allow them to cool on their cookie sheet for about 5 minutes, then move to a wire rack to finish cooling.
These cookies are very soft - you don't want them to over bake or turn brown at all. They will continue to set-up as they cool.