How much peanut butter would replace in cookie recipe?

* What are you replacing the peanut butter with? Are you trying to make a peanut butter-free cookie? Or are you replacing something else with peanut butter?

* What is the original recipe calling for? What ingredient(s) are you trying to substitute? How much of it is used?

* What kind of cookie are you making? Some recipes are more flexible than others when it comes to substitutions.

Once I have this information, I can help you figure out how much peanut butter you'd need!