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 ½" balls.
Place ¼ 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.
Notes
Cookie dough can be a little fickle when it comes to altitude, so if you feel like your dough is a little too dry or crumbly you can add a little milk until you reach your desired consistency.For softer peanut butter cookies, don’t flatten them with the fork. They will be puffier and softer.For crispier peanut butter cookies, use a fork to flatten the dough balls.Refrigerate the dough for 30 minutes before rolling into balls for a chewier peanut butter cookie.To soften your butter, you can set it at room temperature for at least an hour or put it in the microwave on defrost for four seconds at a time, just until it’s soft.