These are by far my favorite cookie and the easiest recipe ever.
Preheat oven to 350
1 cup of peanut butter
1 cup of sugar
A splash of vanilla (optional)
Mix all ingredients in a bowl until well blended. Scoop out and roll small balls then place on a cookie sheet. You should end up with about 16-20 balls. Grab a fork and a cup of water and gently press each ball until flat then press again making an X dipping your fork in the water each time.
Bake for 10-12 minutes. Oven times will vary. Enjoy with a cold glass of milk.