I know declaring anything to be "the world's best" is the quickest way to invite dissent, but I have to say, I adore these cookies. And I've eaten my share of peanut butter cookies, too. So until there's a Miss Peanut Butter Cookie pageant where all the peanut butter cookies can be judged (and not just on their looks, either - it's what's inside that counts) I'm just going to go ahead and claim this title.
2 cups creamy peanut butter
2 cups sugar
2 large eggs
2 teaspoons baking soda
A pinch of salt
1 teaspoon vanilla
Preheat the oven to 350*. Beat the peanut butter and sugar in a medium bowl with an electric mixer until fluffy. Beat in the eggs and then the baking soda, salt, and vanilla.
Roll the dough into 1-inch balls; place them 2 inches apart on a cookie sheet. Use a fork to flatten cookies (honestly, they aren't peanut butter cookies unless they've been cross-hatched, I don't know why.)
Bake the cookies, one sheet at a time, in the middle of the oven for 10 minutes, or until they're puffy and golden brown. Let them sit on the cookie sheet for a couple of minutes, then transfer them to a wire rack to cool. Makes 3 to 4 dozen cookies.
Taken from "One Bite Won't Kill You" by Ann Hodgman. Find it here on Amazon.