Add half a bag of chocolate chips to a large bowl, add half a bag of peanut butter chips to a large bowl. Cut a piece of parchment paper to fit in a 9 by 9" pan.
Once the chocolate has completely melted, add the vanilla extract to the melted chocolate and pour the melted chocolate fudge, and peanut butter fudge, alternating spoonfuls into a 9” x 9” square baking pan lined with parchment paper.