Preheat oven to 350 degrees F.
In your mixer bowl (or large bowl with hand-mixer) cream butter and sugar until smooth, about 1 minute.
Beat in peppermint emulsion and egg.
Add cocoa powder and mix until incorporated.
Add baking powder and espresso powder mix until incorporated.
Add flour and mix until dough is pulling away from the sides of the bowl.
Divide dough into 2 sections and roll out each on wax paper or other prepared surface to ¼" thick.
Cut into desired shapes; this dough does not spread! Bake similar-sized cookies together.
Bake at 350 degrees for 6-7 minutes (depending on cookie size).
Cool cookies on cookie sheet until firm enough to transfer to cooling rack.
Eat plain or decorate!
