Prepare the Oreos. Separate the Oreos into two cookies, taking care to not break them.  Scrape the cream filling from both sides. Cut or break the chocolate cookies in half. Using a serrated knife to cut the cookies in half is recommended.

Prepare the Reese's cups. Unwrap the miniature Reese's peanut butter cups. Set the cups on a parchment paper lined baking sheet, spaced out to be able to decorate the bats.

Melt the chocolate. Pour the semi sweet chocolate chips into a microwave safe piping bag. Microwave for 20-30 second increments on a low to medium heat setting until the chocolate is fully melted. To ensure that the chocolate is evenly melted, you can massage the piping bag in between each increment. Once melted, allow the piping bag to cool for about 2-3 minutes before snipping off a small tip.

Assemble the Oreo bat wings. Pipe a small bit of chocolate in the center of a Reese's cup where you want your Oreo cookie bat wings to go. Working quickly before the chocolate hardens, place the cookie halves on the Reese's cup and hold them in place for a couple seconds while the chocolate sets up a bit. Repeat for all of the cookie "wings".

Add the candy eyes. Pipe a thin line of chocolate where the corners of the halved cookies meet (on top of the Reese's cup). Immediately place two candy eyes on the chocolate. Repeat for the remaining Oreo bats.

Cool and serve. Allow the Oreo bats to cool completely before serving, or transfer the baking sheet to the fridge while the chocolate sets up. Serve and enjoy!