We did something like this a year ago and Aiden loved it so we had to do it again. This time we got premade pizza crust, pizza sauce, black olives and pizza cheese.
It really was not that hard. I let Aiden put the sauce on. Then I tired to do a web with the cheese. It would have been better if you/I used string cheese but I wanted cheese everywhere.
Then you cut the olives in half for the spiders body. And for the legs I just cut 3-4 slices from the half for the legs!
Then pop that sucker in the oven for 10 minutes and your done!