Mix each cake mix separately with ingredients. If needed, use hands to mix in green food coloring (may want to use gloves!). The batter will be thick. If needed, add in 1-2 Tbsp of oil. Take one small ball of each of the batters and moosh them together. Roll into a ball. Drop in powdered sugar and cover. Place on cookie sheet covered in parchment paper. Flatten cookies lightly with the bottom of a glass. Bake at 350 for 8-10 minutes unitl lightly brown around edges. Let them finish baking on pan. Cool on wire rack.