Pre-heat oven to 350°F.
In a large mixing bowl, sift the sugar, cocoa powder, flour, baking soda and salt.
In a stand mixer using the paddle attachment, beat the cream cheese on medium speed until smooth. Add the egg, oil, vanilla extract, peppermint extract, and dry ingredients, and beat at top speed until smooth.
Place approximately 20 tablespoon-size scoops of the batter onto a parchment-lined sheet pan.
Bake for 8-10 minutes, or until a toothpick inserted into the cakes comes out clean. Allow to cool.