Take rounded teaspoons of batter and place on a parchment paper- or Silpat-lined baking sheet approximately 2 inches apart. With moistened hands, slightly flatten the dough. Use a 2" round cookie cutter to cut the flat batter into perfect circles.
Press a mini pretzel into the center of each cookie dough circle.
Bake each batch for 9 minutes at 375 F. Set on a rack to cool.
Beer Buttercream Instructions
In the bowl of a stand mixer, beat butter on high speed for three minutes until light and fluffy, scraping down the sides of the bowl as needed.
Mix in powdered sugar a little bit at a time.
Mix in beer and salt until fully combined.
Sandwich frosting between cooled cookies.
Notes
Double the frosting recipe if you like a lot of filling in your Oreos.