Heat oven to 350 degrees. Use a nonstick pizza pan, or spray your pizza pan with nonstick cooking spray.
Place a piece of parchment or wax paper down on your surface. Open the sugar cookie dough and start spreading with your hands. You want to spread the dough out into a circle that fits inside your pizza pan.
When it gets large enough, transfer the dough to the pizza pan and continue spreading the dough out to the edges.
Bake your cookie pizza according to the package instructions – approximately 12 – 14 minutes or until the edges are brown. Let cool for at least 20 minutes.
While the cookie pizza is cooling, make the vanilla frosting. Place 2 cups of confectioners’ sugar in a bowl. Add 2 tablespoons butter, 2 tablespoons milk, and ½ teaspoon vanilla extract to the sugar. Stir to combine.
Use a knife to spread the frosting out onto the cookie, completely covering the cookie top.
Immediately dot black decorators gel in the center of your cookie. Create circles around the center dot, working your way from the inside to the outside.
Using a toothpick or BBQ skewer, drag through the icing from the center to the outside to create spiderwebs. Rotate the pan and keep repeating the dragging of the toothpick from the inside to the outside.
Unwrap your Hershey's Kisses and place them randomly around the pizza.
Dot “eyes” on the kisses with frosting to create spiders. Add legs by cutting purple or black licorice strings into strips and placing into the frosting near (or on top of) the kisses.
Let the icing set. Cut into slices with a pizza cutter and serve.