Blend cake mixes, butter and eggs together. Mixture will be stiff.
Roll, or scoop, into 1" balls.
Place on parchment lined baking sheet. Bake for 9 minutes. You will want them to look a little under baked. Let cook on baking sheet for 5 minutes. Remove to wire rack to finish cooling.
FROSTING:
Mix cream cheese and butter together until combined.
Add powdered sugar, peppermint extract, salt and green food coloring. Mix until combined.
Spread on flat side of one cookie and top with another cookie to make sandwich.