Heat oven to 350 F.
In mixing bowl, mix cake mix, flour, cocoa powder and sugar. Blend in milk, eggs and butter.
Cover two cookie sheets with parchment paper. Pour half the mixture onto each sheet. Bake 25-30 minutes.
Let cookies cool then freeze 1 hour. Use cookie cutters to make desired shapes.
To make frosting: In bowl, mix butter, cream cheese and whipping cream. Slowly blend in powdered sugar.
Using knife or piping bag, frost cookies. Sprinkle with sanding sugar for sparkly snow appearance, if desired.