Line a baking sheet with wax paper. Set aside.
Use an electric hand mixer to cream together the unsalted butter, creamy peanut butter, and vanilla extract.
Add the powdered sugar about ¼ cup at a time, mixing between each addition.
Scoop 1 teaspoon of the peanut butter mixture at a time and roll it between your palms to form it into a ball.
Place the peanut butter ball on top of a pretzel snap. Place another pretzel on top and gently press so that it forms a sandwich. Continue until all of the peanut butter mixture is used up.
In a small, microwave safe bowl, add the chocolate chips and the vegetable oil. Microwave in 30 second increments, stirring between each session, until the chocolate is melted.
Dip one half of each pretzel sandwich in the melted chocolate, placing it back on the wax-paper lined sheet until all of the pretzel bites are coated. You can also decorate the chocolate with small sprinkles at this point if desired.
Put the cookie sheet in the refrigerator to make the chocolate harden faster if desired. Serve and enjoy!