Step‑by‑Step Instructions for Monster Mash Brownies

• Prepare your frosting colors by dividing the American buttercream frosting into seven portions and coloring as indicated.
• Preheat your oven to 175°C (340°F) and prepare the baking tin with non-stick spray and parchment paper.
• Melt the unsalted butter and dark chocolate in a microwave-safe bowl until smooth.
• Mix the melted butter and chocolate with granulated sugar, then add eggs one at a time while whisking.
• Gently fold in unsweetened cocoa powder and all-purpose flour, then add white and dark chocolate chips.
• Pour the mixture into the prepared baking tin and bake for 30 minutes or until a toothpick comes out with moist crumbs.
• Cool the brownies at room temperature for one hour, then refrigerate for additional hour.
• Cut brownies into 12 squares using a cookie cutter.
• Decorate the brownies as Frankenstein brownies with green frosting, and use decorative piping for details.
• Create mummy brownies with light yellow frosting and add features using black and yellow frosting.
• Decorate spider monster brownies with purple frosting, adding a mouth and legs using liquorice.
• Finish with Dracula brownies by creating a widow's peak and facial features using black and white frosting.