I doubled my recipe and put 1 cup peanut butter powder and 1/3 cup water in my mixer to get it reconstituted. I also used powdered eggs, which are very handy to have around. It makes it OK to eat the dough without worrying about raw eggs (which I never did anyway-- after all, I love Egg Nog!) I reconstituted these, but you can add the powdered eggs in with the flour and add the water separate. I am still trying to decide my favorite method: I haven't found a difference yet. The peanut butter powder is a lot easier to mix than regular peanut butter. And being dried, it won't go rancid if I lose it in the back of the pantry! These yummy cookies have peanut butter, oatmeal, and chocolate chips. They are scrumptious!