I made this Cookie Monster cake for my daughter’s 12th birthday. Everyone loved it!  I used a Wilton ten inch round pan for the cake, and just did one layer. I made butter cream for the frosting, and used Wilton royal blue to get the Cookie Monster color. For the outline, eyes and mouth I used Wilton pre made black (in the tube). For the cookies around the side of the cake, I used the tiny Chips Ahoy that come in the little cup. Turned out great!