Preheat oven to 350 degrees and line a large cookie sheet with parchment paper.
Using a standing mixer or hand mixer, beat the 6 eggs on medium speed until they are light in colour and frothy, about 6 minutes. On a slow speed, add in the cake mix, oil and water until combined and smooth.
Spray your cookie sheet with pam baking spray and cover the cookie sheet with parchment paper. Make sure there is about 3 inches of overhang on each end.
Scoop 1 1⁄2 cup of the cake batter into the small bowl and mix in a few drops of the black gel food colouring. Scoop half of the remaining batter into the medium bowl and mix in a few drops of red gel food colouring.
Scoop the black coloured cake batter into one of the piping bags and cut the tip off. Pipe Mickey Mouse head shapes (you can use a Mickey Mouse cookie cutter to fill in the batter instead) onto the cookie sheet.
Scoop the red cake batter into a second piping bag. Scoop the remaining white batter into a third piping bag. Cut the tips off and pipe red and ‘white’ stripes going diagonal for a candy cane look.
Bake in the oven for 12-14 minutes or until a the top springs back when you touch it.
Place a larger than the cake pan piece of parchment paper onto your counter and sprinkle with powdered sugar.
Once timer goes off, carefully flip over the cake onto the parchment paper. Remove the parchment paper from the cake sheet. Carefully roll the cake up, making sure the bottom parchment paper is being wrapped with the cake. Roll the cake into a tube and allow to cool completely.
Once cooled, unwrap the cake carefully. Spread 2 containers of the cream cheese frosting onto the cake. Carefully re-roll the cake back into a log.
Fit #66 icing tip into one piping bag with the tube of green icing to make the leaf and fit #4 icing tip into the remaining piping bag with the tube of red icing to make the red holly. Pipe random holly leafs around the top of the Mickey Mouse Christmas cake roll.
Place the cake roll into a container with a lid in the fridge until ready to serve!