Step 1: Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan for the wicked witch hat brownies base.
Step 2: In a large bowl, whisk together melted butter and sugar, then add eggs and vanilla until well combined.
Step 3: Sift in the cocoa powder, flour, and salt; fold gently until just combined to keep the wicked witch hat brownies fudgy.
Step 4: Pour the batter into the pan and bake for 22-25 minutes. Let cool completely before cutting into 12 circles using a cookie cutter.
Step 5: Melt the dark chocolate wafers in a microwave-safe bowl in 30-second intervals until smooth.
Step 6: Dip each sugar cone into the melted chocolate, coating it entirely, and place on parchment paper to set for the wicked witch hat brownies topper.
Step 7: Once set, use a dab of frosting to secure a chocolate cone onto each brownie circle.
Step 8: Pipe a green frosting ribbon around the base of the cone where it meets the brownie to complete the wicked witch hat brownies design.