Cut cookie dough in half, and press half of cookie dough into bottom of 9x9 pan with floured fingers.
Meanwhile, mix peanut butter, powdered sugar, and vanilla in bowl. Spread over top of cookie dough.
Crumble the other half of the cookie dough over top of the peanut butter mixture.
Bake at 350 for 30 to 35 minutes, until golden brown.