First, preheat the oven to 350°F and line a square baking dish with parchment paper.

Second, melt half of the giant chocolate bar in the microwave in 30-second intervals. Save the other half for later.

Third, mix the butter and sugar in a large bowl, then beat in the eggs and vanilla for 1-2 minutes until the mixture becomes fluffy and light in color. (I use my stand mixer for this.)

Next, whisk in the melted chocolate.

Then, fold in the flour, cocoa powder, and salt. Try not to overmix, as this will make the brownies more cake-like in texture.

Fold in the remaining half of the chocolate bar after chopping it into pieces.

Then, transfer the brownie batter to the prepared baking dish.

Bake for 30-35 minutes, depending on how fudgy you like your brownies, then cool completely.

In a separate bowl, melt the marshmallows in 30-second intervals.

Take the melted and slightly cooled marshmallow between your fingers and stretch across the cooled brownies to make spider webs.

Once you've made as many spider webs as you like on your brownies, cut them into 9 servings.

Finally, add more spiderwebs to each brownie before serving, and ENJOY!