Using a standing mixer, combine all of the vanilla ingredients into the mixer and mix until stiff peaks form
Scoop two cups of frosting onto the cake and frost the cake
Smooth with an angled spatula until smooth
Place a 9 inch round cake board onto the top of the cake
Split the frosting into three bowls
Mix in leaf green food coloring into one bowl
Mix in mint green food coloring into the second bowl
Leave the third bowl white
Scoop each frosting into their own piping bags
Scoop some white vanilla frosting into the piping bag with the star tip
Cut the tips off the piping bags
Pipe the darker green around the edge of the bottom of the cake twice
Pipe the lighter green around the middle twice
Pipe the white frosting around the top twice
Smooth with an angled spatula
In a small pot, heat up the heavy whipping cream until simmering
Place the chocolate chips into a heat safe bowl
Once the heavy whipping cream is steaming, pour the heavy whipping cream over the chocolate chips and let sit for a minute
Whisk until smooth
Gradually pour the chocolate ganache into drizzles over the top of the cake
Allow the ganache to harden
Pipe vanilla frosting, sprinkle some crushed Oreos over the vanilla frosting, place the whole Oreos onto the side of the frosting
Cut into slices and enjoy