Preheat oven to 550 degrees with baking steel or pizza stone inside the oven for 1 hour.
Meanwhile, make your dough by mixing the sourdough starter, flour and salt together (adding a bit of flour at a time until it takes shape but is still a little sticky) and knead the dough for about 30 seconds.
Place the dough in lightly floured bowl and cover with a towel, set aside for 1 hour.
Flour surface and roll out the dough. Put a floured pizza peel under the dough.
Bake pizza in the oven at 550 degrees F. for 6-8 minutes.
Remove pizza from oven and let cool for 5 minutes.
Pierce pizza dough with a knife, if its is still puffed up, and flatten the dough.
Pour on the milk chocolate and spread. Add cut up Snickers, Caramilk, and Reese Peanut Butter Cups.
Pour white chocolate into a ziploc bag and use as a pastry bag, by cutting just the tip off of the end of the bag so the white chocolate can come out. Make a spider web design with the white chocolate on top of the pizza. Add the M&M Peanuts, slice and serve.