Preheat oven to 350°F (175°C). Grease and flour an 8x8 inch baking pan.

In a medium saucepan, melt butter over low heat. Remove from heat and stir in granulated sugar and cocoa powder until smooth.

Beat in eggs one at a time, then stir in vanilla extract.

In a separate bowl, whisk together flour and salt.

Gradually add dry ingredients to the wet ingredients, mixing until just combined. Fold in chocolate chips.

Pour batter into the prepared pan and spread evenly.

Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs.

Let brownies cool completely in the pan on a wire rack.

While brownies are cooling, prepare the spiderweb frosting. In a small bowl, whisk together powdered sugar, milk, and vanilla extract until smooth. Add black food coloring and mix until evenly colored.

Once brownies are completely cool, spread the black frosting evenly over the top.

To create the spiderweb, place a few small dots of white frosting (or thinned white icing) in concentric circles on top of the black frosting. Use a toothpick to drag lines from the center outwards to create the web effect. Alternatively, use a piping bag with a fine tip.

Cut brownies into squares and serve.