Grease your 9x13 inch baking pan or line it with parchment paper.
In a large mixing bowl, combine the butter, peanut butter, and vanilla extract. Mix until smooth.
Gradually add the confectioners sugar and mix until incorporated. Adjust sweetness to taste.
Fold in the pretzel twists until evenly distributed.
Transfer the mixture into the prepared baking pan and press down firmly.
In a microwave-safe bowl, melt the chopped chocolate in 30-second intervals, stirring until smooth.
Pour the melted chocolate over the peanut butter layer and spread evenly.
Chill the pan in the refrigerator for at least 2 hours until set.
Remove from the pan, cut into squares or rectangles, and enjoy!
