Bake the 2 ready cake mix as one large round cake (follow steps on package)

leave cake to cool down for several hours

flip cake on a tray and leave the cake up-side down to leave the flat side up

warm the nutella so that it is easy to spread on the cake (30seconds on microwave). Make sure there are no silver or gold covers on it before so that it won't blow up the microwave.

spread the nutella on the cake using a spatula. make sure you cover all areas including the sides.

Cut the kit kat bars into half (2 together). Place the kit kats on the side of the cake consecutively.

using the ribbon wrap it around the kit kats and tie a knot. make sure the knot holds the kit kats close and tight

spread the m&m's on the top of the cake and leave no empty spaces. Leave the cake to chill in the fridge for a few hours and its ready to serve

you can have fun and decorate the cake top as you wish like in the pictures