Brownies

1. Preheat oven to 325º F.
2. Line an 8 square pan with parchment paper and spray with cooking spray.
3. Heat butter and chocolate in a double boiler or in the microwave, stirring it until it melts.
4. Transfer chocolate mixture to a stand mixer, add sugar and vanilla extract, and mix on medium speed for 2-3 minutes until it is well blended.
5. Add eggs, one at a time, and mix until combined, scraping down the sides of the bowl as needed.
6. With the mixer on low, slowly add in the flour, cocoa powder, and salt to the chocolate mixture and mix just until combined.
7. Carefully pour the batter into the pan and smooth it out until it is even.
8. Bake brownies for 40-45 minutes until a toothpick inserted in the center of it comes out clean.
9. Cool on cooling rack.

Frosting

1. Blend together the butter, powdered sugar, black cocoa powder, and vanilla until smooth.
2. Scrape down the bowl as needed.

Assembly

1. Once the brownies have cooled, place the marshmallows in a heatproof bowl and microwave for a few seconds. Stir and microwave for a few more seconds if needed.
2. Once the marshmallow is slightly cooled, dip your fingers into it and while hovering over the brownies spread them apart to create a web design. Carefully lower them down on the top of the brownies until they adhere to the top of it. Repeat this process several times from different angles until you have a few layers of web and like the design.
3. Transfer half the chocolate frosting to a pastry bag fitted with a small round piping tip such as Wilton #1. Transfer the other half to a pastry bag fitted with a slightly larger tip such as Wilton #8.
4. Use the larger piping tip to pipe a round dot onto the brownies for the spider body and then a slightly smaller one directly above it for the head.
5. Use the smaller piping tip to add 4 legs on each side of the body. Repeat this process until you have added as many spiders as you like. Enjoy!