For Oreos:

1. In stand mixer, beat together butter and sugar until creamy. Add in egg and beat until incorporated. Scrape down sides of bowl.
2. With mixer set to low, slowly add in cocoa powder and flour. Mix until thoroughly incorporated and mix is even.
3. Split dough into two and wrap each ball of dough in plastic wrap. Flatten dough into disk and fridge and cool for at least 20 minutes.
4. Preheat oven to 350 degrees. On a floured surface, roll out dough one disk at a time – to 1/8” thickness.
5. Using a 1 ½” circle cookie cutter, cut out cookies and place on a parchment lined baking sheet. Reroll dough if necessary to use all dough.
6. Bake for 12 minutes. Let cookies remain on baking sheet for a couple of minutes and then remove to finish cooling on wire rack.

For filling:

1. In stand mixer, beat together butter, vanilla and peppermint extract. Add in salt.
2. With mixer set to low, add in powdered sugar. Add in one teaspoon of milk and slightly thin frosting. Mix in green food color.
3. Spread frosting onto cookie and sandwich together. Enjoy!